[clang] Use proper type to left shift after D117262

Causing warnings like
warning C4334: '<<': result of 32-bit shift implicitly converted to 64 bits
as reported in D117262.

Author: aeubanks

clang/lib/CodeGen/Address.h

@@ -66,7 +66,7 @@ template <typename T> class AddressImpl<T, true> {
   llvm::Type *getElementType() const { return ElementType.getPointer(); }
   CharUnits getAlignment() const {
     unsigned AlignLog = (Pointer.getInt() << 3) | ElementType.getInt();
-    return CharUnits::fromQuantity(1UL << AlignLog);
+    return CharUnits::fromQuantity(CharUnits::QuantityType(1) << AlignLog);
   }
 };