x86: Properly merge GNU_PROPERTY_X86_ISA_1_USED

x86: Properly merge GNU_PROPERTY_X86_ISA_1_USED

Without the GNU_PROPERTY_X86_ISA_1_USED property, all ISAs may be used.
If a bit in the GNU_PROPERTY_X86_ISA_1_USED property is unset, the
corresponding x86 instruction set isn’t used.  When merging properties
from 2 input files and one input file doesn't have the
GNU_PROPERTY_X86_ISA_1_USED property, the output file shouldn't have
it neither.  This patch removes the GNU_PROPERTY_X86_ISA_1_USED
property if an input file doesn't have it.

This patch replaces the GNU_PROPERTY_X86_ISA_1_USED property with the
GNU_PROPERTY_X86_ISA_1_NEEDED property which is the minimum ISA
requirement.

bfd/

	PR ld/23486
	* elfxx-x86.c (_bfd_x86_elf_merge_gnu_properties): Remove
	GNU_PROPERTY_X86_ISA_1_USED if an input file doesn't have it.
	(_bfd_x86_elf_link_setup_gnu_properties): Adding the
	GNU_PROPERTY_X86_ISA_1_NEEDED, instead of
	GNU_PROPERTY_X86_ISA_1_USED, property.

ld/

	PR ld/23486
	* testsuite/ld-i386/i386.exp: Run PR ld/23486 tests.
	* testsuite/ld-x86-64/x86-64.exp: Likewise.
	* testsuite/ld-i386/pr23486a.d: New file.
	* testsuite/ld-i386/pr23486b.d: Likewise.
	* testsuite/ld-x86-64/pr23486a-x32.d: Likewise.
	* testsuite/ld-x86-64/pr23486a.d: Likewise.
	* testsuite/ld-x86-64/pr23486a.s: Likewise.
	* testsuite/ld-x86-64/pr23486b-x32.d: Likewise.
	* testsuite/ld-x86-64/pr23486b.d: Likewise.
	* testsuite/ld-x86-64/pr23486b.s: Likewise.
	* testsuite/ld-i386/property-3.r: Remove "x86 ISA used".
	* testsuite/ld-i386/property-4.r: Likewise.
	* testsuite/ld-i386/property-5.r: Likewise.
	* testsuite/ld-i386/property-x86-ibt3a.d: Likewise.
	* testsuite/ld-i386/property-x86-ibt3b.d: Likewise.
	* testsuite/ld-i386/property-x86-shstk3a.d: Likewise.
	* testsuite/ld-i386/property-x86-shstk3b.d: Likewise.
	* testsuite/ld-x86-64/property-3.r: Likewise.
	* testsuite/ld-x86-64/property-4.r: Likewise.
	* testsuite/ld-x86-64/property-5.r: Likewise.
	* testsuite/ld-x86-64/property-x86-ibt3a-x32.d: Likewise.
	* testsuite/ld-x86-64/property-x86-ibt3a.d: Likewise.
	* testsuite/ld-x86-64/property-x86-ibt3b-x32.d: Likewise.
	* testsuite/ld-x86-64/property-x86-ibt3b.d: Likewise.
	* testsuite/ld-x86-64/property-x86-shstk3a-x32.d: Likewise.
	* testsuite/ld-x86-64/property-x86-shstk3a.d: Likewise.
	* testsuite/ld-x86-64/property-x86-shstk3b-x32.d: Likewise.
	* testsuite/ld-x86-64/property-x86-shstk3b.d: Likewise.