[Coroutines][NFC] Only look for Alloca or Load when finding dbg.declare for temp spills

[weiwang]

Summary

We only look for Alloca or Load in this case, so making it explicit.

[MatzeB]

LGTM

llvm/lib/Transforms/Coroutines/CoroFrame.cpp

1868

[ChuanqiXu]

LGTM. Thanks.

llvm/lib/Transforms/Coroutines/CoroFrame.cpp

1868

nit

[weiwang]

Apply comment

llvm/lib/Transforms/Coroutines/CoroFrame.cpp

for (auto *U : E.second) {
         if (F->getSubprogram()) {
           auto *CurDef = Def;
           while (DIs.empty() && isa<LoadInst>(CurDef)) {
             auto *LdInst = cast<LoadInst>(CurDef);
             // Only consider ptr to ptr same type load.
             if (LdInst->getPointerOperandType() != LdInst->getType())
               break;
             CurDef = LdInst->getPointerOperand();
+            if (!isa<AllocaInst, LoadInst>(CurDef))
+              break;
             DIs = FindDbgDeclareUses(CurDef);
           }
         }
 
         for (DbgDeclareInst *DDI : DIs) {
           bool AllowUnresolved = false;
           // This dbg.declare is preserved for all coro-split function
           // fragments. It will be unreachable in the main function, and