Continued fix for 351257. Reusing the feedback vector is too complex.

test/cctest/test-compiler.cc

Index: test/cctest/test-compiler.cc
diff --git a/test/cctest/test-compiler.cc b/test/cctest/test-compiler.cc
index 120a0533853339804adce806437522b9b2e44896..00f29d446d1ceb7c805e9108ae7807ac879751d2 100644
--- a/test/cctest/test-compiler.cc
+++ b/test/cctest/test-compiler.cc
@@ -312,6 +312,43 @@ TEST(GetScriptLineNumber) {
 }
 
 
+TEST(FeedbackVectorRecreatedOnScopeChanges) {
+  if (i::FLAG_always_opt || !i::FLAG_lazy) return;
+  CcTest::InitializeVM();
+  v8::HandleScope scope(CcTest::isolate());
+
+  CompileRun("function builder() {"
+             "  call_target = function() { return 3; };"
+             "  return (function() {"
+             "    eval('');"
+             "    return function() {"
+             "      'use strict';"
+             "      call_target();"
+             "    }"
+             "  })();"
+             "}"
+             "morphing_call = builder();");
+
+  Handle<JSFunction> f =
+      v8::Utils::OpenHandle(
+          *v8::Handle<v8::Function>::Cast(
+              CcTest::global()->Get(v8_str("morphing_call"))));
+
+  // morphing_call should have one feedback vector slot for the call to
+  // call_target(), scoping analysis having been performed.
+  CHECK_EQ(1, f->shared()->feedback_vector()->length());
+  // And yet it's not compiled.
+  CHECK(!f->shared()->is_compiled());
+
+  CompileRun("morphing_call();");
+
+  // On scoping analysis after lazy compile, the call is now a global
+  // call which needs no feedback vector slot.
+  CHECK_EQ(0, f->shared()->feedback_vector()->length());
+  CHECK(f->shared()->is_compiled());
+}
+
+
 // Test that optimized code for different closures is actually shared
 // immediately by the FastNewClosureStub when run in the same context.
 TEST(OptimizedCodeSharing) {