[ELF] - Fixed failture of mips-64-got.s on x32 configuration.

win32 was my case.
Before that change test failed with next error for me:
23>  ******************** TEST 'lld :: ELF/mips-64-got.s' FAILED ********************
....
23>  Command 3 Stderr:
23>  relocation R_MIPS_GOT_PAGE out of range

llvm-svn: 269166