[ptr-compr] Fix broken ptr-compr build

Bug: v8:7703
Change-Id: I2fe68c54e59fd452ee724ce7fbd80eca6ab5e096
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1541106
Auto-Submit: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Ben Titzer <titzer@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60493}

src/wasm/wasm-objects.h

@@ -527,8 +527,14 @@ class WasmInstanceObject : public JSObject {
   DEFINE_FIELD_OFFSET_CONSTANTS(JSObject::kHeaderSize,
                                 WASM_INSTANCE_OBJECT_FIELDS)
   STATIC_ASSERT(IsAligned(kSize, kTaggedSize));
-#define ASSERT_FIELD_ALIGNED(offset, size) \
-  STATIC_ASSERT(size == 0 || IsAligned(offset, size));
+  // TODO(ishell, v8:8875): When pointer compression is enabled 8-byte size
+  // fields (external pointers, doubles and BigInt data) are only kTaggedSize
+  // aligned so checking for alignments of fields bigger than kTaggedSize
+  // doesn't make sense until v8:8875 is fixed.
+#define ASSERT_FIELD_ALIGNED(offset, size)                                 \
+  STATIC_ASSERT(size == 0 || IsAligned(offset, size) ||                    \
+                (COMPRESS_POINTERS_BOOL && (size == kSystemPointerSize) && \
+                 IsAligned(offset, kTaggedSize)));
   WASM_INSTANCE_OBJECT_FIELDS(ASSERT_FIELD_ALIGNED)
 #undef ASSERT_FIELD_ALIGNED
 #undef WASM_INSTANCE_OBJECT_FIELDS