Mix pointers twice in absl::Hash.

PiperOrigin-RevId: 714244777
Change-Id: I832f29fe195d13154469be8292d091291a8f928b

absl/hash/internal/hash.h

@@ -460,12 +460,8 @@ std::enable_if_t<std::is_pointer<T>::value, H> AbslHashValue(H hash_state,
   // Due to alignment, pointers tend to have low bits as zero, and the next few
   // bits follow a pattern since they are also multiples of some base value. The
   // byte swap in WeakMix helps ensure we still have good entropy in low bits.
-#if defined(__APPLE__) || defined(__ANDROID__) || defined(_MSC_VER) || \
-    defined(ABSL_HAVE_ADDRESS_SANITIZER) || defined(ABSL_HAVE_THREAD_SANITIZER)
-  // In these build modes, pointers may have less entropy so mix pointers twice.
+  // Mix pointers twice to ensure we have good entropy in low bits.
   return H::combine(std::move(hash_state), v, v);
-#endif
-  return H::combine(std::move(hash_state), v);
 }
 
 // AbslHashValue() for hashing nullptr_t