Revert "[Clang] Extend EmitPseudoVariable to support debug records (llvm#94956)"

This reverts commit 5c268cf.

Author: huangjd

clang/lib/CodeGen/CGDebugInfo.cpp

@@ -5766,16 +5766,28 @@ void CGDebugInfo::EmitPseudoVariable(CGBuilderTy &Builder,
   // it is loaded upon use, so we identify such pattern here.
   if (llvm::LoadInst *Load = dyn_cast<llvm::LoadInst>(Value)) {
     llvm::Value *Var = Load->getPointerOperand();
-    // There can be implicit type cast applied on a variable if it is an opaque
-    // ptr, in this case its debug info may not match the actual type of object
-    // being used as in the next instruction, so we will need to emit a pseudo
-    // variable for type-casted value.
-    auto DeclareTypeMatches = [&](auto *DbgDeclare) {
-      return DbgDeclare->getVariable()->getType() == Type;
-    };
-    if (any_of(llvm::findDbgDeclares(Var), DeclareTypeMatches) ||
-        any_of(llvm::findDVRDeclares(Var), DeclareTypeMatches))
-      return;
+    if (llvm::Metadata *MDValue = llvm::ValueAsMetadata::getIfExists(Var)) {
+      if (llvm::Value *DbgValue = llvm::MetadataAsValue::getIfExists(
+              CGM.getLLVMContext(), MDValue)) {
+        for (llvm::User *U : DbgValue->users()) {
+          if (llvm::CallInst *DbgDeclare = dyn_cast<llvm::CallInst>(U)) {
+            if (DbgDeclare->getCalledFunction()->getIntrinsicID() ==
+                    llvm::Intrinsic::dbg_declare &&
+                DbgDeclare->getArgOperand(0) == DbgValue) {
+              // There can be implicit type cast applied on a variable if it is
+              // an opaque ptr, in this case its debug info may not match the
+              // actual type of object being used as in the next instruction, so
+              // we will need to emit a pseudo variable for type-casted value.
+              llvm::DILocalVariable *MDNode = cast<llvm::DILocalVariable>(
+                  cast<llvm::MetadataAsValue>(DbgDeclare->getOperand(1))
+                      ->getMetadata());
+              if (MDNode->getType() == Type)
+                return;
+            }
+          }
+        }
+      }
+    }
   }
 
   // Find the correct location to insert a sequence of instructions to