[wasm] Fix bounds check for zero initial memory.

src/s390/assembler-s390.cc

Index: src/s390/assembler-s390.cc
diff --git a/src/s390/assembler-s390.cc b/src/s390/assembler-s390.cc
index a448947307df5c39b741017dca0ce774cccecc6b..f7284571541f1eb52c354c5cf197ffe26f0566d9 100644
--- a/src/s390/assembler-s390.cc
+++ b/src/s390/assembler-s390.cc
@@ -233,6 +233,12 @@ Address RelocInfo::wasm_global_reference() {
   return Assembler::target_address_at(pc_, host_);
 }
 
+uint8_t RelocInfo::wasm_memtype_size_reference() {
+  DCHECK(IsWasmMemorySizeReference(rmode_));
+  return static_cast<uint8_t>(
+      reinterpret_cast<intptr_t>(Assembler::target_address_at(pc_, host_)));
+}
+
 void RelocInfo::unchecked_update_wasm_memory_reference(
     Address address, ICacheFlushMode flush_mode) {
   Assembler::set_target_address_at(isolate_, pc_, host_, address, flush_mode);