[clang] [llvm] Remove support for 3DNow!, both intrinsics and builtins. (PR #96246)

[Simon Pilgrim via llvm-commits]

================
@@ -481,7 +481,7 @@ defm WriteAESKeyGen : X86SchedWritePair<ReadAfterVecXLd>; // Key Generation.
 // Carry-less multiplication instructions.
 defm WriteCLMul : X86SchedWritePair<ReadAfterVecXLd>;
 
-// EMMS/FEMMS
----------------
RKSimon wrote:

keep these - FEMMS still uses this sched class

https://github.com/llvm/llvm-project/pull/96246