[wasm] prototype for breakpoint support.

src/wasm/wasm-external-refs.h

Index: src/wasm/wasm-external-refs.h
diff --git a/src/wasm/wasm-external-refs.h b/src/wasm/wasm-external-refs.h
index ac938d6d67d9147d9ae36a54fbf8009f843b984a..9a84a4fb07b753d314e2de3cebd898c11a1a6c53 100644
--- a/src/wasm/wasm-external-refs.h
+++ b/src/wasm/wasm-external-refs.h
@@ -9,6 +9,10 @@
 
 namespace v8 {
 namespace internal {
+
+// Forward declaration.
+class JSObject;
+
 namespace wasm {
 
 void f32_trunc_wrapper(float* param);
@@ -58,6 +62,7 @@ uint32_t word64_ctz_wrapper(uint64_t* input);
 uint32_t word32_popcnt_wrapper(uint32_t* input);
 
 uint32_t word64_popcnt_wrapper(uint64_t* input);
+
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8