x86-64: Use PLT address for PC-relative reloc

x86-64: Use PLT address for PC-relative reloc

Since PLT in PDE and PC-relative PLT in PIE can be used as function
address, there is no need for dynamic PC-relative relocation against
a dynamic function definition in PIE.  Linker should resolve PC-relative
reference to its PLT address.

NB: i386 has non-PIC PLT and PIC PLT.  Only non-PIC PLT in PDE can
be used as function address.  PIC PLT in PIE can't be used as
function address.

bfd/

	PR ld/22842
	* elf32-i386.c (elf_i386_check_relocs): Pass FALSE for non
	PC-relative PLT to NEED_DYNAMIC_RELOCATION_P.
	* elf64-x86-64.c (elf_x86_64_check_relocs): Create PLT for
	R_X86_64_PC32 reloc against dynamic function in data section.
	Pass TRUE for PC-relative PLT to NEED_DYNAMIC_RELOCATION_P.
	(elf_x86_64_relocate_section): Use PLT for R_X86_64_PC32 reloc
	against dynamic function in data section.
	* elfxx-x86.c (elf_x86_allocate_dynrelocs): Use PLT in PIE as
	function address only if pcrel_plt is true.
	(_bfd_x86_elf_link_hash_table_create): Set pcrel_plt.
	* elfxx-x86.h (NEED_DYNAMIC_RELOCATION_P): Add PCREL_PLT for
	PC-relative PLT.  If PLT is PC-relative, don't generate dynamic
	PC-relative relocation against a function definition in data
	secton in PIE.  Remove the obsolete comments.
	(elf_x86_link_hash_table): Add pcrel_plt.

ld/

	PR ld/22842
	* testsuite/ld-i386/i386.exp: Run PR ld/22842 tests.
	* testsuite/ld-x86-64/x86-64.exp: Likewise.
	* testsuite/ld-i386/pr22842a.c: New file.
	* testsuite/ld-i386/pr22842b.S: Likewise.
	* testsuite/ld-x86-64/pr22842a.c: Likewise.
	* testsuite/ld-x86-64/pr22842a.rd: Likewise.
	* testsuite/ld-x86-64/pr22842b.S: Likewise.
	* testsuite/ld-x86-64/pr22842b.rd: Likewise.