[turbofan] Fix bug in OSR deconstruction.

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 7bf74cca57a8eaf983c8d079d97a9610e2e1a04e..c5e3f15f32174a4789f46b3287ef03d1285ca3c9 100644
--- a/src/runtime/runtime-test.cc
+++ b/src/runtime/runtime-test.cc
@@ -111,10 +111,10 @@ RUNTIME_FUNCTION(Runtime_OptimizeFunctionOnNextCall) {
 
 RUNTIME_FUNCTION(Runtime_OptimizeOsr) {
   HandleScope scope(isolate);
-  RUNTIME_ASSERT(args.length() == 0);
+  RUNTIME_ASSERT(args.length() == 0 || args.length() == 1);
   Handle<JSFunction> function = Handle<JSFunction>::null();
 
-  {
+  if (args.length() == 0) {
     // Find the JavaScript function on the top of the stack.
     JavaScriptFrameIterator it(isolate);
     while (!it.done()) {
@@ -124,6 +124,10 @@ RUNTIME_FUNCTION(Runtime_OptimizeOsr) {
       }
     }
     if (function.is_null()) return isolate->heap()->undefined_value();
+  } else {
+    // Function was passed as an argument.
+    CONVERT_ARG_HANDLE_CHECKED(JSFunction, arg, 0);
+    function = arg;
   }
 
   // The following assertion was lifted from the DCHECK inside