TypeRefID: Only add high bits of a pointer if on 64-bit

Adding another 0 to the TypeRefID bits is useless on 32-bit
platforms.

Author: bitjammer

include/swift/Reflection/TypeRef.h

@@ -56,9 +56,11 @@ class TypeRefID {
 
   template <typename T>
   void addPointer(const T *Pointer) {
-    auto Raw = reinterpret_cast<uintptr_t>(Pointer);
-    Bits.push_back((uint32_t)Raw);
-    Bits.push_back(Raw >> 32);
+    auto Raw = reinterpret_cast<uint32_t *>(&Pointer);
+    Bits.push_back(Raw[0]);
+    if (sizeof(const T *) > 4) {
+      Bits.push_back(Raw[1]);
+    }
   }
 
   void addInteger(uint32_t Integer) {