Import x86-64-ABI revision 227
Import x86-64-ABI revision 228
Import x86-64-ABI revision 229
Import x86-64-ABI revision 230
Add .gitignore
Correct large model PIC function call example
Replace @GOTOFF64 with @GOTOFF in medium PIC model
Deprecate R_X86_64_GOTPLT64
Use multi-byte nop in PLT entry