[llvm] [PowerPC][NFC] clean up if-else block in PPCRegisterInfo.cpp (PR #140084)

[zhijian lin via llvm-commits]

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@@ -1610,62 +1610,69 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
   // Get the instruction opcode.
   unsigned OpC = MI.getOpcode();
 
-  if ((OpC == PPC::DYNAREAOFFSET || OpC == PPC::DYNAREAOFFSET8)) {
+  switch (OpC) {
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diggerlin wrote:

there is not default for the switch , is there a compile warning or error for it ?

https://github.com/llvm/llvm-project/pull/140084