x86: Turn PLT32 to PC32 only for PC-relative relocations

commit 292676c15a615b5a95bede9ee91004d3f7ee7dfd
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Feb 13 13:44:17 2020 -0800

    x86: Resolve PLT32 reloc aganst local symbol to section

resolved PLT32 relocation against local symbol to section and

commit 2585b7a5ce5830e60a089aa2316a329558902f0c
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun Jul 19 06:51:19 2020 -0700

    x86: Change PLT32 reloc against section to PC32

turned PLT32 relocation against section into PC32 relocation.  But these
transformations are valid only for PC-relative relocations.  Add fx_pcrel
check for PC-relative relocations when performing these transformations
to keep PLT32 relocation in `movq $foo@PLT, %rax`.

gas/

	PR gas/32196
	* config/tc-i386.c (tc_i386_fix_adjustable): Return fixP->fx_pcrel
	for PLT32 relocations.
	(i386_validate_fix): Turn PLT32 relocation into PC32 relocation
	only if fixp->fx_pcrel is set.
	* testsuite/gas/i386/reloc32.d: Updated.
	* testsuite/gas/i386/reloc64.d: Likewise.
	* testsuite/gas/i386/reloc32.s: Add PR gas/32196 test.
	* testsuite/gas/i386/reloc64.s: Likewise.

ld/

	PR gas/32196
	* testsuite/ld-x86-64/plt3.s: New file.
	* testsuite/ld-x86-64/x86-64.exp: Run plt3.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>