[clang] [llvm] Remove 3dnow from X86TargetParser. (PR #99352)

[Shengchen Kan via cfe-commits]

================
@@ -175,8 +175,6 @@ X86_FEATURE_COMPAT(AVX512BF16,      "avx512bf16",            34)
 X86_FEATURE_COMPAT(AVX512VP2INTERSECT, "avx512vp2intersect", 35)
 // Below Features has some missings comparing to gcc, it's because gcc has some
 // not one-to-one mapped in llvm.
-X86_FEATURE_COMPAT(3DNOW,           "3dnow",                  0)
-X86_FEATURE       (3DNOWA,          "3dnowa")
----------------
KanRobert wrote:

I think you can put sub-features of APX here if you do not have better candidates. `egpr,ndd,push2pop2,ppx,ccmp,cf,nf,zu`

https://github.com/llvm/llvm-project/pull/99352