[wasm] grow_memory(0) is the same as memory_size()

test/cctest/wasm/test-run-wasm-module.cc

Index: test/cctest/wasm/test-run-wasm-module.cc
diff --git a/test/cctest/wasm/test-run-wasm-module.cc b/test/cctest/wasm/test-run-wasm-module.cc
index b358208bc3aebb829695453ed9ba80a00041073e..0e2ed1b0fe2e377a2e5ff09b39af4c9bb93424ab 100644
--- a/test/cctest/wasm/test-run-wasm-module.cc
+++ b/test/cctest/wasm/test-run-wasm-module.cc
@@ -283,6 +283,21 @@ TEST(Run_WasmModule_MemSize_GrowMem) {
   TestModule(&zone, builder, kExpectedValue);
 }
 
+TEST(GrowMemoryZero) {
+  // Initial memory size is 16, see wasm-module-builder.cc
+  static const int kExpectedValue = 16;
+  TestSignatures sigs;
+  v8::internal::AccountingAllocator allocator;
+  Zone zone(&allocator);
+
+  WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
+  WasmFunctionBuilder* f = builder->AddFunction(sigs.i_v());
+  ExportAsMain(f);
+  byte code[] = {WASM_GROW_MEMORY(WASM_I32V(0))};
+  f->EmitCode(code, sizeof(code));
+  TestModule(&zone, builder, kExpectedValue);
+}
+
 TEST(Run_WasmModule_GrowMemoryInIf) {
   TestSignatures sigs;
   v8::internal::AccountingAllocator allocator;