[X86][APX] Suppress EGPR/NDD instructions for relocations (#136660)
Suppress EGPR/NDD instructions for relocations to avoid APX relocation
types emitted. This is to keep backward compatibility with old version
of linkers without APX support. The use case is to try APX features with
LLVM + old built-in linker on RHEL9 OS which is expected to be EOL in
2032.
If there are APX relocation types, the old version of linkers would
raise "unsupported relocation type" error. Example:
```
$ llvm-mc -filetype=obj -o got.o -triple=x86_64-unknown-linux got.s
$ ld got.o -o got.exe
ld: got.o: unsupported relocation type 0x2b
...
$ cat got.s
...
movq foo@GOTPCREL(%rip), %r16
$ llvm-objdump -dr got.o
...
1: d5 48 8b 05 00 00 00 00 movq (%rip), %r16
0000000000000005: R_X86_64_CODE_4_GOTPCRELX foo-0x4
```
llvm-project
bd6addc0 - [X86][APX] Suppress EGPR/NDD instructions for relocations (#136660)
