[wasm] Fix bounds check for zero initial memory.

src/arm64/assembler-arm64.cc

Index: src/arm64/assembler-arm64.cc
diff --git a/src/arm64/assembler-arm64.cc b/src/arm64/assembler-arm64.cc
index 9ee20d45e2409f3df222cfa0996db877546528b0..ea0d0ea2a817599f98e952705c08a8ddd113f4c7 100644
--- a/src/arm64/assembler-arm64.cc
+++ b/src/arm64/assembler-arm64.cc
@@ -194,6 +194,11 @@ Address RelocInfo::wasm_global_reference() {
   return Memory::Address_at(Assembler::target_pointer_address_at(pc_));
 }
 
+uint8_t RelocInfo::wasm_memtype_size_reference() {
+  DCHECK(IsWasmMemtypeSizeReference(rmode_));
+  return Memory::uint8_at(Assembler::target_pointer_address_at(pc_));
+}
+
 void RelocInfo::unchecked_update_wasm_memory_reference(
     Address address, ICacheFlushMode flush_mode) {
   Assembler::set_target_address_at(isolate_, pc_, host_, address, flush_mode);