[llvm] Replace calls to Type::getPointerTo (NFC)

Cleanup work towards removing the method Type::getPointerTo.

If a call to Type::getPointerTo is used solely to support an unneeded
pointer-cast, remove the call entirely.

Author: JOE1994

llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp

@@ -791,7 +791,7 @@ bool IRTranslator::emitJumpTableHeader(SwitchCG::JumpTable &JT,
 
   // This value may be smaller or larger than the target's pointer type, and
   // therefore require extension or truncating.
-  Type *PtrIRTy = SValue.getType()->getPointerTo();
+  auto *PtrIRTy = PointerType::getUnqual(SValue.getContext());
   const LLT PtrScalarTy = LLT::scalar(DL->getTypeSizeInBits(PtrIRTy));
   Sub = MIB.buildZExtOrTrunc(PtrScalarTy, Sub);
 

llvm/lib/CodeGen/InterleavedLoadCombinePass.cpp

@@ -1215,13 +1215,9 @@ bool InterleavedLoadCombineImpl::combine(std::list<VectorInfo> &InterleavedLoad,
     return false;
   }
 
-  // Create a pointer cast for the wide load.
-  auto CI = Builder.CreatePointerCast(InsertionPoint->getOperand(0),
-                                      ILTy->getPointerTo(),
-                                      "interleaved.wide.ptrcast");
-
   // Create the wide load and update the MemorySSA.
-  auto LI = Builder.CreateAlignedLoad(ILTy, CI, InsertionPoint->getAlign(),
+  auto Ptr = InsertionPoint->getPointerOperand();
+  auto LI = Builder.CreateAlignedLoad(ILTy, Ptr, InsertionPoint->getAlign(),
                                       "interleaved.wide.load");
   auto MSSAU = MemorySSAUpdater(&MSSA);
   MemoryUse *MSSALoad = cast<MemoryUse>(MSSAU.createMemoryAccessBefore(

llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp

@@ -4836,7 +4836,7 @@ void DAGTypeLegalizer::ExpandIntRes_XMULO(SDNode *N,
 
   // Also pass the address of the overflow check.
   Entry.Node = Temp;
-  Entry.Ty = PtrTy->getPointerTo();
+  Entry.Ty = PointerType::getUnqual(PtrTy->getContext());
   Entry.IsSExt = true;
   Entry.IsZExt = false;
   Args.push_back(Entry);

llvm/lib/CodeGen/TargetLoweringBase.cpp

@@ -1941,9 +1941,9 @@ TargetLoweringBase::getSafeStackPointerLocation(IRBuilderBase &IRB) const {
   // Android provides a libc function to retrieve the address of the current
   // thread's unsafe stack pointer.
   Module *M = IRB.GetInsertBlock()->getParent()->getParent();
-  Type *StackPtrTy = PointerType::getUnqual(M->getContext());
-  FunctionCallee Fn = M->getOrInsertFunction("__safestack_pointer_address",
-                                             StackPtrTy->getPointerTo(0));
+  auto *PtrTy = PointerType::getUnqual(M->getContext());
+  FunctionCallee Fn =
+      M->getOrInsertFunction("__safestack_pointer_address", PtrTy);
   return IRB.CreateCall(Fn);
 }