6l: Relocate CMOV* instructions
The linker avoids a GOT indirection by turning a MOV into
a LEA, but with x86-64 GCC has started emitting CMOV*
instructions which break the existing logic.
This will generate errors such as:
unexpected GOT reloc for non-dynamic symbol luaO_nilobject_
The CMOV* instructions may be emitted with normal code like:
if (o >= L->top) return cast(TValue *, luaO_nilobject);
else return o;
Which gets compiled into (relocation offset at 1b):
13: 48 3b 47 10 cmp 0x10(%rdi),%rax
17: 48 0f 43 05 00 00 00 cmovae 0x0(%rip),%rax
1e: 00
This change will allow the indirection through the GOT to
avoid the problem in those cases.
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/
4071044