[llvm] AMDGPU/GlobalISel: add RegBankLegalize rules for bitfield extract (PR #132381)

[Matt Arsenault via llvm-commits]

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@@ -127,6 +132,112 @@ void RegBankLegalizeHelper::widenLoad(MachineInstr &MI, LLT WideTy,
   MI.eraseFromParent();
 }
 
+static bool isSignedBFE(MachineInstr &MI) {
+  if (GIntrinsic *GI = dyn_cast<GIntrinsic>(&MI)) {
+    if (GI->is(Intrinsic::amdgcn_sbfe))
+      return true;
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arsenm wrote:

Can just return the GI->is, I don't think it's particularly important that this function only be called with the BFE ops 

https://github.com/llvm/llvm-project/pull/132381