[DirectX] Pointer type bitcast must be have same size.

[farzonl]

DXILPrepare.cpp adds NoOp bitcasts that are causing problems in the validator

llvm-project/llvm/lib/Target/DirectX/DXILPrepare.cpp

Lines 216 to 245 in c7f350f

	// Emtting NoOp bitcast instructions allows the ValueEnumerator to be
	// unmodified as it reserves instruction IDs during contruction.
	if (auto LI = dyn_cast<LoadInst>(&I)) {
	if (Value *NoOpBitcast = maybeGenerateBitcast(
	Builder, PointerTypes, I, LI->getPointerOperand(),
	LI->getType())) {
	LI->replaceAllUsesWith(
	Builder.CreateLoad(LI->getType(), NoOpBitcast));
	LI->eraseFromParent();
	}
	continue;
	}
	if (auto SI = dyn_cast<StoreInst>(&I)) {
	if (Value *NoOpBitcast = maybeGenerateBitcast(
	Builder, PointerTypes, I, SI->getPointerOperand(),
	SI->getValueOperand()->getType())) {
	SI->replaceAllUsesWith(
	Builder.CreateStore(SI->getValueOperand(), NoOpBitcast));
	SI->eraseFromParent();
	}
	continue;
	}
	if (auto GEP = dyn_cast<GetElementPtrInst>(&I)) {
	if (Value *NoOpBitcast = maybeGenerateBitcast(
	Builder, PointerTypes, I, GEP->getPointerOperand(),
	GEP->getSourceElementType()))
	GEP->setOperand(0, NoOpBitcast);
	continue;
	}

It is changing

store float 2.000000e+00, ptr addrspace(3) getelementptr (float, ptr addrspace(3) @arrayofVecData.scalarized.1dim, i32 1), align 4

to:

%2 = bitcast ptr addrspace(3) getelementptr (float, ptr addrspace(3) @arrayofVecData.scalarized.1dim, i32 1) to ptr addrspace(3)
store float 2.000000e+00, ptr addrspace(3) %2, align 4

commenting out these no ops resolves all 848 ptr bitcast errors.