A few minor fixups to use C++ rather than C and Windows-isms

Author: llvm-beanz

lib/HLSL/HLOperationLower.cpp

@@ -542,7 +542,7 @@ Value *TrivialUnaryOperationRet(CallInst *CI, IntrinsicOp IOP,
 Value *TrivialDxilUnaryOperation(OP::OpCode OpCode, Value *Src, hlsl::OP *Op,
                                  IRBuilder<> &Builder,
                                  bool SupportsVectors = false) {
-  Type *Ty = src->getType();
+  Type *Ty = Src->getType();
 
   Constant *OpArg = Op->GetU32Const((unsigned)OpCode);
   Value *Args[] = {OpArg, Src};

tools/clang/lib/Sema/SemaHLSL.cpp

@@ -6606,8 +6606,10 @@ bool HLSLExternalSource::MatchArguments(
   argTypes.clear();
   const bool isVariadic = IsVariadicIntrinsicFunction(pIntrinsic);
 
-  static const UINT UnusedSize = UINT_MAX;
-  static const BYTE MaxIntrinsicArgs = g_MaxIntrinsicParamCount + 1;
+  static const uint32_t UnusedSize = std::numeric_limits<uint32_t>::max();
+  static const uint32_t MaxIntrinsicArgs = g_MaxIntrinsicParamCount + 1;
+  assert(MaxIntrinsicArgs < std::numeric_limits<uint8_t>::max() &&
+         "This should be a pretty small number");
 #define CAB(cond, arg)                                                         \
   {                                                                            \
     if (!(cond)) {                                                             \