[wasm] Fix bounds check for zero initial memory.

src/x87/assembler-x87.cc

Index: src/x87/assembler-x87.cc
diff --git a/src/x87/assembler-x87.cc b/src/x87/assembler-x87.cc
index 62b662f28560e38acba73b0db7c9f4f66f1803fd..00751baacafc3f42500bc1071282f686e33e68f5 100644
--- a/src/x87/assembler-x87.cc
+++ b/src/x87/assembler-x87.cc
@@ -116,6 +116,11 @@ uint32_t RelocInfo::wasm_memory_size_reference() {
   return Memory::uint32_at(pc_);
 }
 
+uint8 RelocInfo::wasm_memtype_size_reference() {
+  DCHECK(IsWasmMemtypeSizeReference(rmode_));
+  return Memory::uint8_at(pc_);
+}
+
 void RelocInfo::unchecked_update_wasm_memory_reference(
     Address address, ICacheFlushMode flush_mode) {
   Memory::Address_at(pc_) = address;