[Interpreter] Optimize equality check with null/undefined with a check on the map.

test/cctest/test-serialize.cc

Index: test/cctest/test-serialize.cc
diff --git a/test/cctest/test-serialize.cc b/test/cctest/test-serialize.cc
index d7051d3b80ac6086ce2bcdad93b5b5676033fad9..4980fac725b59696706e29c59ee3d5da477ebc4e 100644
--- a/test/cctest/test-serialize.cc
+++ b/test/cctest/test-serialize.cc
@@ -1075,7 +1075,7 @@ TEST(CodeSerializerLargeCodeObject) {
   Vector<const uint8_t> source =
       ConstructSource(STATIC_CHAR_VECTOR("var j=1; if (j == 0) {"),
                       STATIC_CHAR_VECTOR("for (let i of Object.prototype);"),
-                      STATIC_CHAR_VECTOR("} j=7; j"), 1000);
+                      STATIC_CHAR_VECTOR("} j=7; j"), 1050);

[mythria, 2016/12/05 17:48:12]

This test checks if large code objects are allocated in large object space.
After this optimization, I had to increase the size for it to be allocated in
the large object space. 

[rmcilroy, 2016/12/05 19:08:09]

Acknowledged.

   Handle<String> source_str =
       isolate->factory()->NewStringFromOneByte(source).ToHandleChecked();