[llvm] Fix SIFixSGPRCopies To Handle Physical Registers (PR #149859)

[Patrick Simmons via llvm-commits]

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@@ -246,6 +246,22 @@ LiveVariables::FindLastPartialDef(Register Reg,
   return LastDef;
 }
 
+static void fixupLiveIns(MachineInstr &MI, MCPhysReg SubReg) {
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linuxrocks123 wrote:

This code was necessary to get the added testcase to pass; otherwise it would crash in LiveVariables.

https://github.com/llvm/llvm-project/pull/149859