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

Opaque ptr cleanup effort (NFC)

Author: JOE1994

clang/lib/CodeGen/MicrosoftCXXABI.cpp

@@ -2986,7 +2986,6 @@ MicrosoftCXXABI::EmitMemberFunctionPointer(const CXXMethodDecl *MD) {
     NonVirtualBaseAdjustment -= getContext().getOffsetOfBaseWithVBPtr(RD);
 
   // The rest of the fields are common with data member pointers.
-  FirstField = llvm::ConstantExpr::getBitCast(FirstField, CGM.VoidPtrTy);
   return EmitFullMemberPointer(FirstField, /*IsMemberFunction=*/true, RD,
                                NonVirtualBaseAdjustment, VBTableIndex);
 }
@@ -3981,7 +3980,7 @@ llvm::Constant *MicrosoftCXXABI::getAddrOfRTTIDescriptor(QualType Type) {
 
   // Check to see if we've already declared this TypeDescriptor.
   if (llvm::GlobalVariable *GV = CGM.getModule().getNamedGlobal(MangledName))
-    return llvm::ConstantExpr::getBitCast(GV, CGM.Int8PtrTy);
+    return GV;
 
   // Note for the future: If we would ever like to do deferred emission of
   // RTTI, check if emitting vtables opportunistically need any adjustment.
@@ -4007,7 +4006,7 @@ llvm::Constant *MicrosoftCXXABI::getAddrOfRTTIDescriptor(QualType Type) {
       MangledName);
   if (Var->isWeakForLinker())
     Var->setComdat(CGM.getModule().getOrInsertComdat(Var->getName()));
-  return llvm::ConstantExpr::getBitCast(Var, CGM.Int8PtrTy);
+  return Var;
 }
 
 /// Gets or a creates a Microsoft CompleteObjectLocator.
@@ -4200,8 +4199,6 @@ llvm::Constant *MicrosoftCXXABI::getCatchableType(QualType T,
       CopyCtor = getAddrOfCXXCtorClosure(CD, Ctor_CopyingClosure);
     else
       CopyCtor = CGM.getAddrOfCXXStructor(GlobalDecl(CD, Ctor_Complete));
-
-    CopyCtor = llvm::ConstantExpr::getBitCast(CopyCtor, CGM.Int8PtrTy);
   } else {
     CopyCtor = llvm::Constant::getNullValue(CGM.Int8PtrTy);
   }
@@ -4411,14 +4408,11 @@ llvm::GlobalVariable *MicrosoftCXXABI::getThrowInfo(QualType T) {
   if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
     if (CXXDestructorDecl *DtorD = RD->getDestructor())
       if (!DtorD->isTrivial())
-        CleanupFn = llvm::ConstantExpr::getBitCast(
-            CGM.getAddrOfCXXStructor(GlobalDecl(DtorD, Dtor_Complete)),
-            CGM.Int8PtrTy);
+        CleanupFn = CGM.getAddrOfCXXStructor(GlobalDecl(DtorD, Dtor_Complete));
   // This is unused as far as we can tell, initialize it to null.
   llvm::Constant *ForwardCompat =
       getImageRelativeConstant(llvm::Constant::getNullValue(CGM.Int8PtrTy));
-  llvm::Constant *PointerToCatchableTypes = getImageRelativeConstant(
-      llvm::ConstantExpr::getBitCast(CTA, CGM.Int8PtrTy));
+  llvm::Constant *PointerToCatchableTypes = getImageRelativeConstant(CTA);
   llvm::StructType *TIType = getThrowInfoType();
   llvm::Constant *Fields[] = {
       llvm::ConstantInt::get(CGM.IntTy, Flags), // Flags