[llvm] [X86] Check for AMXTile (PR #136507)

[Phoebe Wang via llvm-commits]

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@@ -75,6 +75,8 @@ bool X86LowerTileCopy::runOnMachineFunction(MachineFunction &MF) {
     return false;
 
   const X86Subtarget &ST = MF.getSubtarget<X86Subtarget>();
+  if (!ST.hasAMXTILE())
+    return false;
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phoebewang wrote:

Isn't it guaranteed by line 74 already?

https://github.com/llvm/llvm-project/pull/136507