[llvm] [AMDGPU] Fix resource analysis crash on alias-to-alias function (PR #99034)

[Joseph Huber via llvm-commits]

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@@ -65,9 +65,10 @@ static const Function *getCalleeFunction(const MachineOperand &Op) {
     assert(Op.getImm() == 0);
     return nullptr;
   }
-  if (auto *GA = dyn_cast<GlobalAlias>(Op.getGlobal()))
-    return cast<Function>(GA->getOperand(0));
-  return cast<Function>(Op.getGlobal());
+  const GlobalValue *GV = Op.getGlobal();
+  while (auto *GA = dyn_cast<GlobalAlias>(GV))
+    GV = cast<GlobalValue>(GA->getOperand(0));
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jhuber6 wrote:

I thought there might be one, so I did a cursory look at `Alias.h` but didn't find anything. Maybe there's one I missed.

https://github.com/llvm/llvm-project/pull/99034