[SR-14813] Tidy up the DLQ_GetPtrAuthMask case.

We should be using C++ casts here.

Author: al45tair

tools/swift-reflection-fuzzer/swift-reflection-fuzzer.cpp

@@ -77,9 +77,9 @@ class ObjectMemoryReader : public MemoryReader {
     case DLQ_GetPtrAuthMask: {
       auto result = static_cast<uintptr_t *>(outBuffer);
 #if __has_feature(ptrauth_calls)
-      *result = (uintptr_t)ptrauth_strip((void*)0x0007ffffffffffff, 0);
+      *result = static_cast<uintptr_t>(ptrauth_strip(static_cast<void *>(0x0007ffffffffffff), 0));
 #else
-      *result = (uintptr_t)~0ull;
+      *result = ~uintptr_t(0);
 #endif
       return true;
     }