sframe: Allow input R_*_NONE relocations

"ld -r" generates R_*_NONE relocations in sframe section if input
relocations in sframe section are against discarded section.  Allow
input R_*_NONE relocations if there are more relocation entries than
SFrame entries, instead of assuming number of SFrame entries == number
of relocation entries.

bfd/

	PR ld/33127
	* elf-sframe.c (sframe_decoder_init_func_bfdinfo): Allow input
	R_*_NONE relocations if there are more relocation entries than
	SFrame entries.

ld/

	PR ld/33127
	* testsuite/ld-x86-64/sframe-reloc-2a.s: New file.
	* testsuite/ld-x86-64/sframe-reloc-2b.s: Likewise.
	* testsuite/ld-x86-64/x86-64.exp: Run PR ld/33127 tests.

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