x86: Clean up gcc.target/i386/auto-init-* tests

1. Replace ia32 with { ! lp64 } to enable ILP32 tests for -mx32.
2. Replace lp64 with { ! ia32 } to enable x86-64 ISA tests for -mx32.
3. For auto-init-3.c, add -msse and -mfpmath=387 for ia32.

	* gcc.target/i386/auto-init-2.c: Replace ia32 with { ! lp64 }.
	* gcc.target/i386/auto-init-3.c (dg-options): Add -msse.
	(dg-additional-options): Add -mfpmath=387 for ia32.
	Replace lp64 with { ! ia32 }. Add a space after ia32.
	* gcc.target/i386/auto-init-4.c: Replace lp64 with { ! ia32 }.
	* gcc.target/i386/auto-init-5.c: Likewise.
	* gcc.target/i386/auto-init-padding-3.c: Likewise.
	* gcc.target/i386/auto-init-padding-7.c: Likewise.
	* gcc.target/i386/auto-init-padding-8.c: Likewise.
	* gcc.target/i386/auto-init-padding-9.c: Likewise.
8 files changed