[ptr-compr] Define kTaggedPayloadOffset correctly on Big Endian

smi size is sill 8 bytes when V8_COMPRESS_POINTERS is undefined.

Bug: v8:7703
Change-Id: I0d1e757e42e8b1e6b10960420135245e24553175
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1508572
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Auto-Submit: Junliang Yan <jyan@ca.ibm.com>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60097}

src/objects/embedder-data-slot.h

@@ -36,10 +36,10 @@ class EmbedderDataSlot
   V8_INLINE EmbedderDataSlot(EmbedderDataArray array, int entry_index);
   V8_INLINE EmbedderDataSlot(JSObject object, int embedder_field_index);
 
-#ifdef V8_TARGET_LITTLE_ENDIAN
-  static constexpr int kTaggedPayloadOffset = 0;
-#else
+#if defined(V8_TARGET_BIG_ENDIAN) && defined(V8_COMPRESS_POINTERS)
   static constexpr int kTaggedPayloadOffset = kTaggedSize;
+#else
+  static constexpr int kTaggedPayloadOffset = 0;
 #endif
 
 #ifdef V8_COMPRESS_POINTERS