[CodeGenModule] Remove no-op ptr-to-ptr bitcasts (NFC)

Opaque ptr cleanup effort (NFC)

Author: JOE1994

clang/lib/CodeGen/CodeGenModule.cpp

@@ -1983,9 +1983,9 @@ void CodeGenModule::EmitCtorList(CtorList &Fns, const char *GlobalName) {
   for (const auto &I : Fns) {
     auto ctor = ctors.beginStruct(CtorStructTy);
     ctor.addInt(Int32Ty, I.Priority);
-    ctor.add(llvm::ConstantExpr::getBitCast(I.Initializer, CtorPFTy));
+    ctor.add(I.Initializer);
     if (I.AssociatedData)
-      ctor.add(llvm::ConstantExpr::getBitCast(I.AssociatedData, VoidPtrTy));
+      ctor.add(I.AssociatedData);
     else
       ctor.addNullPointer(VoidPtrTy);
     ctor.finishAndAddTo(ctors);
@@ -4555,9 +4555,7 @@ llvm::Constant *CodeGenModule::GetFunctionStart(const ValueDecl *Decl) {
   llvm::GlobalValue *F =
       cast<llvm::GlobalValue>(GetAddrOfFunction(Decl)->stripPointerCasts());
 
-  return llvm::ConstantExpr::getBitCast(
-      llvm::NoCFIValue::get(F),
-      llvm::PointerType::get(VMContext, F->getAddressSpace()));
+  return llvm::NoCFIValue::get(F);
 }
 
 static const FunctionDecl *