Fix SH GOT allocation in the presence of linker garbage collection.
PR ld/17739
ld * emulparams/shelf.sh (CHECK_RELOCS_AFTER_OPEN_INPUT): Define with
valye 'yes'.
* emulparams/shelf32.sh: Likewise.
* emulparams/shelf32.sh: Likewise.
* emulparams/shelf_nto.sh: Likewise.
* emulparams/shelf_nto.sh: Likewise.
* emulparams/shelf_vxworks.sh: Likewise.
* emulparams/shelf_vxworks.sh: Likewise.
* emulparams/shlelf32_linux.sh: Likewise.
* emulparams/shlelf32_linux.sh: Likewise.
* emulparams/shlelf_linux.sh: Likewise.
* emulparams/shlelf_linux.sh: Likewise.
* emulparams/shlelf_nto.sh: Likewise.
* emulparams/shlelf_nto.sh: Likewise.
bfd * elf32-sh.c (sh_elf_gc_sweep_hook): Delete.
(elf_backend_sweep_hook): Delete.