[wasm] Fix bounds check for zero initial memory.

src/assembler.h

Index: src/assembler.h
diff --git a/src/assembler.h b/src/assembler.h
index a925032e2d72bb86995ea1d798f687c403f50019..b8bb02357154e9e4e2c341041d0076dcf8bcebbc 100644
--- a/src/assembler.h
+++ b/src/assembler.h
@@ -393,6 +393,7 @@ class RelocInfo {
     WASM_MEMORY_REFERENCE,
     WASM_GLOBAL_REFERENCE,
     WASM_MEMORY_SIZE_REFERENCE,
+    WASM_MEMTYPE_SIZE_REFERENCE,
     CELL,
 
     // Everything after runtime_entry (inclusive) is not GC'ed.
@@ -437,7 +438,7 @@ class RelocInfo {
     FIRST_REAL_RELOC_MODE = CODE_TARGET,
     LAST_REAL_RELOC_MODE = VENEER_POOL,
     LAST_CODE_ENUM = DEBUGGER_STATEMENT,
-    LAST_GCED_ENUM = WASM_MEMORY_SIZE_REFERENCE,
+    LAST_GCED_ENUM = WASM_MEMTYPE_SIZE_REFERENCE,
     FIRST_SHAREABLE_RELOC_MODE = CELL,
   };
 
@@ -530,9 +531,21 @@ class RelocInfo {
   static inline bool IsWasmMemorySizeReference(Mode mode) {
     return mode == WASM_MEMORY_SIZE_REFERENCE;
   }
+  static inline bool IsWasmMemtypeSizeReference(Mode mode) {
+    return mode == WASM_MEMTYPE_SIZE_REFERENCE;
+  }
   static inline bool IsWasmGlobalReference(Mode mode) {
     return mode == WASM_GLOBAL_REFERENCE;
   }
+  static inline bool IsWasmReference(Mode mode) {
+    return mode == WASM_MEMORY_REFERENCE ||
+           mode == WASM_MEMORY_SIZE_REFERENCE ||
+           mode == WASM_MEMTYPE_SIZE_REFERENCE || mode == WASM_GLOBAL_REFERENCE;
+  }
+  static inline bool IsWasmSizeReference(Mode mode) {
+    return mode == WASM_MEMORY_SIZE_REFERENCE ||
+           mode == WASM_MEMTYPE_SIZE_REFERENCE;
+  }
   static inline int ModeMask(Mode mode) { return 1 << mode; }
 
   // Accessors
@@ -562,6 +575,7 @@ class RelocInfo {
   Address wasm_memory_reference();
   Address wasm_global_reference();
   uint32_t wasm_memory_size_reference();
+  uint8_t wasm_memtype_size_reference();
   void update_wasm_memory_reference(
       Address old_base, Address new_base, uint32_t old_size, uint32_t new_size,
       ICacheFlushMode icache_flush_mode = FLUSH_ICACHE_IF_NEEDED);