Remove a few more getPointerElementType() calls.

The change in getScalarOrArrayConstantInt() is not actually exercised by the
current test suite, and it may be impossible to exercise it given that the
caller of the function relies on the parameter being a GEP of array type.
However, this change should correctly deduce the type were it a correct call.

The call in SPIRVRegularizeLLVM is of course unnecessary with opaque pointers:
addrspacecast can never change the pointee type of a pointer type in such
scenarios.

Original commit:
KhronosGroup/SPIRV-LLVM-Translator@4b415cb

Author: jcranmer-intel

llvm-spirv/lib/SPIRV/SPIRVRegularizeLLVM.cpp

@@ -633,12 +633,11 @@ bool SPIRVRegularizeLLVMBase::regularize() {
         // Add an additional bitcast in case address space cast also changes
         // pointer element type.
         if (auto *ASCast = dyn_cast<AddrSpaceCastInst>(&II)) {
-          Type *DestTy = ASCast->getDestTy();
-          Type *SrcTy = ASCast->getSrcTy();
-          if (DestTy->getPointerElementType() !=
-              SrcTy->getPointerElementType()) {
+          PointerType *DestTy = cast<PointerType>(ASCast->getDestTy());
+          PointerType *SrcTy = cast<PointerType>(ASCast->getSrcTy());
+          if (!DestTy->hasSameElementTypeAs(SrcTy)) {
             PointerType *InterTy = PointerType::getWithSamePointeeType(
-                cast<PointerType>(DestTy), SrcTy->getPointerAddressSpace());
+                DestTy, SrcTy->getPointerAddressSpace());
             BitCastInst *NewBCast = new BitCastInst(
                 ASCast->getPointerOperand(), InterTy, /*NameStr=*/"", ASCast);
             AddrSpaceCastInst *NewASCast =

llvm-spirv/lib/SPIRV/SPIRVUtil.cpp

@@ -1235,8 +1235,12 @@ Value *getScalarOrArrayConstantInt(Instruction *Pos, Type *T, unsigned Len,
     assert(Len == 1 && "Invalid length");
     return ConstantInt::get(IT, V, IsSigned);
   }
-  if (auto PT = dyn_cast<PointerType>(T)) {
-    auto ET = PT->getPointerElementType();
+  if (isa<PointerType>(T)) {
+    unsigned PointerSize =
+        Pos->getModule()->getDataLayout().getPointerTypeSizeInBits(T);
+    auto *ET = Type::getIntNTy(T->getContext(), PointerSize);
+    assert(cast<PointerType>(T)->isOpaqueOrPointeeTypeMatches(ET) &&
+           "Pointer-to-non-size_t arguments are not valid for this call");
     auto AT = ArrayType::get(ET, Len);
     std::vector<Constant *> EV(Len, ConstantInt::get(ET, V, IsSigned));
     auto CA = ConstantArray::get(AT, EV);