[asm.js] [wasm] Store function start position for stack check

src/runtime/runtime-test.cc

Index: src/runtime/runtime-test.cc
diff --git a/src/runtime/runtime-test.cc b/src/runtime/runtime-test.cc
index 024c441b9315b7073a97c7c541cc46c5c105ab96..1c5d6554f3374f30fe55cabf92581f54e7d30ccf 100644
--- a/src/runtime/runtime-test.cc
+++ b/src/runtime/runtime-test.cc
@@ -699,6 +699,13 @@ RUNTIME_FUNCTION(Runtime_IsAsmWasmCode) {
   return isolate->heap()->true_value();
 }
 
+RUNTIME_FUNCTION(Runtime_IsWasmCode) {
+  SealHandleScope shs(isolate);
+  DCHECK_EQ(1, args.length());
+  CONVERT_ARG_CHECKED(JSFunction, function, 0);
+  bool is_js_to_wasm = function->code()->kind() == Code::JS_TO_WASM_FUNCTION;
+  return isolate->heap()->ToBoolean(is_js_to_wasm);
+}
 
 #define ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(Name)       \
   RUNTIME_FUNCTION(Runtime_Has##Name) {                  \