[wasm] Add inspector test for stepping

src/runtime/runtime-wasm.cc

Index: src/runtime/runtime-wasm.cc
diff --git a/src/runtime/runtime-wasm.cc b/src/runtime/runtime-wasm.cc
index dd9cf7783e413d84a0b31f1734114efe18d1c4ca..1c737aeeee3b38e7499aed33242f1ec29b9fce99 100644
--- a/src/runtime/runtime-wasm.cc
+++ b/src/runtime/runtime-wasm.cc
@@ -169,6 +169,9 @@ RUNTIME_FUNCTION(Runtime_WasmRunInterpreter) {
   CHECK(arg_buffer_obj->IsSmi());
   uint8_t* arg_buffer = reinterpret_cast<uint8_t*>(*arg_buffer_obj);
 
+  // Reset the current isolate's context.
+  isolate->set_context(*instance->compiled_module()->native_context());

[titzer, 2017/01/25 10:04:09]

Do we need to set it back when returning, or will the CEntryStub do that?

[Yang, 2017/01/25 10:12:22]

We have a SaveContext scope. Is that something you should/could use?

[Clemens Hammacher, 2017/01/25 11:41:57]

I am not sure if resetting is needed, but since this is not performance critical
code, I just added a SaveContext scope.

+
   instance->debug_info()->RunInterpreter(func_index, arg_buffer);
   return isolate->heap()->undefined_value();
 }