testsuite: Automatically add check_function_bodies options

It's easy to forget that i386 check-function-bodies tests require:

  { dg-add-options check_function_bodies }

This patch makes:

  { dg-final { check-function-bodies ... } }

add the options automatically.

This means that the dg-final must come after the final dg-options (like
the dg-add-options must).  That already seemed to be the case for every
test in the patch.

gcc/
	* doc/sourcebuild.texi: Document that check-function-bodies
	automatically adds the check_function_bodies options.

gcc/testsuite/
	* lib/gcc-dg.exp (dg-final): Add check_function_bodies options
	for check-function-bodies directives.
	* g++.target/i386/cf_check-3.C: Remove explicit
	{ dg-add-options check_function_bodies }.
	* g++.target/i386/cf_check-4.C: Likewise.
	* g++.target/i386/memset-pr101366-1.C: Likewise.
	* g++.target/i386/memset-pr101366-2.C: Likewise.
	* g++.target/i386/memset-pr108585-1a.C: Likewise.
	* g++.target/i386/memset-pr108585-1b.C: Likewise.
	* g++.target/i386/memset-pr118276-1a.C: Likewise.
	* g++.target/i386/memset-pr118276-1b.C: Likewise.
	* g++.target/i386/memset-pr118276-1c.C: Likewise.
	* gcc.target/i386/20040112-1.c: Likewise.
	* gcc.target/i386/builtin-copysign-2.c: Likewise.
	* gcc.target/i386/builtin-copysign-3.c: Likewise.
	* gcc.target/i386/builtin-copysign-4.c: Likewise.
	* gcc.target/i386/builtin-copysign-5.c: Likewise.
	* gcc.target/i386/builtin-copysign-6.c: Likewise.
	* gcc.target/i386/builtin-copysign-7.c: Likewise.
	* gcc.target/i386/builtin-copysign-8a.c: Likewise.
	* gcc.target/i386/builtin-copysign-8b.c: Likewise.
	* gcc.target/i386/builtin-fabs-1.c: Likewise.
	* gcc.target/i386/builtin-memmove-10.c: Likewise.
	* gcc.target/i386/builtin-memmove-11a.c: Likewise.
	* gcc.target/i386/builtin-memmove-11b.c: Likewise.
	* gcc.target/i386/builtin-memmove-11c.c: Likewise.
	* gcc.target/i386/builtin-memmove-12.c: Likewise.
	* gcc.target/i386/builtin-memmove-13.c: Likewise.
	* gcc.target/i386/builtin-memmove-14.c: Likewise.
	* gcc.target/i386/builtin-memmove-15.c: Likewise.
	* gcc.target/i386/builtin-memmove-1a.c: Likewise.
	* gcc.target/i386/builtin-memmove-1b.c: Likewise.
	* gcc.target/i386/builtin-memmove-1c.c: Likewise.
	* gcc.target/i386/builtin-memmove-1d.c: Likewise.
	* gcc.target/i386/builtin-memmove-2a.c: Likewise.
	* gcc.target/i386/builtin-memmove-2b.c: Likewise.
	* gcc.target/i386/builtin-memmove-2c.c: Likewise.
	* gcc.target/i386/builtin-memmove-2d.c: Likewise.
	* gcc.target/i386/builtin-memmove-3a.c: Likewise.
	* gcc.target/i386/builtin-memmove-3b.c: Likewise.
	* gcc.target/i386/builtin-memmove-3c.c: Likewise.
	* gcc.target/i386/builtin-memmove-4a.c: Likewise.
	* gcc.target/i386/builtin-memmove-4b.c: Likewise.
	* gcc.target/i386/builtin-memmove-4c.c: Likewise.
	* gcc.target/i386/builtin-memmove-5a.c: Likewise.
	* gcc.target/i386/builtin-memmove-5b.c: Likewise.
	* gcc.target/i386/builtin-memmove-5c.c: Likewise.
	* gcc.target/i386/builtin-memmove-6.c: Likewise.
	* gcc.target/i386/builtin-memmove-7.c: Likewise.
	* gcc.target/i386/builtin-memmove-8.c: Likewise.
	* gcc.target/i386/builtin-memmove-9.c: Likewise.
	* gcc.target/i386/cf_check-11.c: Likewise.
	* gcc.target/i386/cf_check-7.c: Likewise.
	* gcc.target/i386/memcpy-pr120683-1.c: Likewise.
	* gcc.target/i386/memcpy-pr120683-2.c: Likewise.
	* gcc.target/i386/memcpy-pr120683-3.c: Likewise.
	* gcc.target/i386/memcpy-pr120683-4.c: Likewise.
	* gcc.target/i386/memcpy-pr120683-5.c: Likewise.
	* gcc.target/i386/memcpy-pr120683-6.c: Likewise.
	* gcc.target/i386/memcpy-pr120683-7.c: Likewise.
	* gcc.target/i386/memcpy-strategy-12.c: Likewise.
	* gcc.target/i386/memset-pr120683-1.c: Likewise.
	* gcc.target/i386/memset-pr120683-10.c: Likewise.
	* gcc.target/i386/memset-pr120683-11.c: Likewise.
	* gcc.target/i386/memset-pr120683-12.c: Likewise.
	* gcc.target/i386/memset-pr120683-13.c: Likewise.
	* gcc.target/i386/memset-pr120683-14.c: Likewise.
	* gcc.target/i386/memset-pr120683-15.c: Likewise.
	* gcc.target/i386/memset-pr120683-16.c: Likewise.
	* gcc.target/i386/memset-pr120683-17.c: Likewise.
	* gcc.target/i386/memset-pr120683-18.c: Likewise.
	* gcc.target/i386/memset-pr120683-19.c: Likewise.
	* gcc.target/i386/memset-pr120683-2.c: Likewise.
	* gcc.target/i386/memset-pr120683-20.c: Likewise.
	* gcc.target/i386/memset-pr120683-21.c: Likewise.
	* gcc.target/i386/memset-pr120683-22.c: Likewise.
	* gcc.target/i386/memset-pr120683-23.c: Likewise.
	* gcc.target/i386/memset-pr120683-3.c: Likewise.
	* gcc.target/i386/memset-pr120683-4.c: Likewise.
	* gcc.target/i386/memset-pr120683-5.c: Likewise.
	* gcc.target/i386/memset-pr120683-6.c: Likewise.
	* gcc.target/i386/memset-pr120683-7.c: Likewise.
	* gcc.target/i386/memset-pr120683-8.c: Likewise.
	* gcc.target/i386/memset-pr120683-9.c: Likewise.
	* gcc.target/i386/memset-pr70308-1a.c: Likewise.
	* gcc.target/i386/memset-pr70308-1b.c: Likewise.
	* gcc.target/i386/memset-strategy-10.c: Likewise.
	* gcc.target/i386/memset-strategy-13.c: Likewise.
	* gcc.target/i386/memset-strategy-25.c: Likewise.
	* gcc.target/i386/memset-strategy-28.c: Likewise.
	* gcc.target/i386/memset-strategy-29.c: Likewise.
	* gcc.target/i386/memset-strategy-30.c: Likewise.
	* gcc.target/i386/pr111673.c: Likewise.
	* gcc.target/i386/pr120936-1.c: Likewise.
	* gcc.target/i386/pr120936-11.c: Likewise.
	* gcc.target/i386/pr120936-2.c: Likewise.
	* gcc.target/i386/pr120936-4.c: Likewise.
	* gcc.target/i386/pr120936-5.c: Likewise.
	* gcc.target/i386/pr120936-9.c: Likewise.
	* gcc.target/i386/pr122343-1a.c: Likewise.
	* gcc.target/i386/pr122343-1b.c: Likewise.
	* gcc.target/i386/pr122343-2a.c: Likewise.
	* gcc.target/i386/pr122343-2b.c: Likewise.
	* gcc.target/i386/pr122343-3.c: Likewise.
	* gcc.target/i386/pr122343-4a.c: Likewise.
	* gcc.target/i386/pr122343-4b.c: Likewise.
	* gcc.target/i386/pr122343-5a.c: Likewise.
	* gcc.target/i386/pr122343-5b.c: Likewise.
	* gcc.target/i386/pr122343-6a.c: Likewise.
	* gcc.target/i386/pr122343-6b.c: Likewise.
	* gcc.target/i386/pr122343-7.c: Likewise.
	* gcc.target/i386/pr122675-1.c: Likewise.
	* gcc.target/i386/pr125355-2.c: Likewise.
	* gcc.target/i386/pr125355.c: Likewise.
	* gcc.target/i386/pr82142a.c: Likewise.
	* gcc.target/i386/pr82142b.c: Likewise.
	* gcc.target/i386/pr92080-17.c: Likewise.

(cherry picked from commit 4280cb5cb3847155350c62616bdc63d649903a65)