x86-64: Never make R_X86_64_GOT64 section relative

x86-64: Never make R_X86_64_GOT64 section relative

R_X86_64_GOT64 relocation should never be made section relative.  Change
tc_i386_fix_adjustable to return 0 for BFD_RELOC_X86_64_GOT64.

gas/

	PR gas/32189
	* config/tc-i386.c (tc_i386_fix_adjustable): Return 0 for
	BFD_RELOC_X86_64_GOT64.
	* testsuite/gas/i386/reloc64.d: Updated.
	* testsuite/gas/i386/reloc64.s: Add more tests for R_X86_64_GOT64
	and R_X86_64_GOTOFF64.

ld/

	PR gas/32189
	* testsuite/ld-x86-64/x86-64.exp: Run PR gas/32189 test.
	* testsuite/ld-x86-64/pr32189.s: New file.

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