[turbofan] Optimize loads from the global object in JSTypeFeedbackSpecializer.

test/cctest/test-decls.cc

Index: test/cctest/test-decls.cc
diff --git a/test/cctest/test-decls.cc b/test/cctest/test-decls.cc
index f3dc77710281e8bc8ffbbe03785a72df5ee9b5f0..bb8e0f3cc34f30482675b143d9455aa10be1cb8d 100644
--- a/test/cctest/test-decls.cc
+++ b/test/cctest/test-decls.cc
@@ -923,6 +923,27 @@ TEST(CrossScriptDynamicLookup) {
 }
 
 
+TEST(CrossScriptGlobal0) {

[Michael Starzinger, 2015/04/22 12:42:18]

nit: Do we need to add this test, since it's just apiece of the
CrossScriptGlobal below?

+  HandleScope handle_scope(CcTest::isolate());
+  {
+    SimpleContext context;
+
+    context.Check(
+        "var global = this;"
+        "global.x = 255;"
+        "x",
+        EXPECT_RESULT, Number::New(CcTest::isolate(), 255));
+    context.Check(
+        "'use strict';"
+        "let x = 1;"
+        "global.x",
+        EXPECT_RESULT, Number::New(CcTest::isolate(), 255));
+    context.Check("global.x = 15; x", EXPECT_RESULT,
+                  Number::New(CcTest::isolate(), 1));
+  }
+}
+
+
 TEST(CrossScriptGlobal) {
   HandleScope handle_scope(CcTest::isolate());
   {