ES6: Add support for method shorthand in object literals

src/contexts.h

Index: src/contexts.h
diff --git a/src/contexts.h b/src/contexts.h
index 63c9955b9791aa95b7d32b51e240d1774a489a19..04bff926b0575eb6e26439f958eb2f1ad3c88597 100644
--- a/src/contexts.h
+++ b/src/contexts.h
@@ -551,14 +551,21 @@ class Context: public FixedArray {
     return kHeaderSize + index * kPointerSize - kHeapObjectTag;
   }
 
-  static int FunctionMapIndex(StrictMode strict_mode, bool is_generator) {
-    return is_generator
-      ? (strict_mode == SLOPPY
-         ? SLOPPY_GENERATOR_FUNCTION_MAP_INDEX
-         : STRICT_GENERATOR_FUNCTION_MAP_INDEX)
-      : (strict_mode == SLOPPY
-         ? SLOPPY_FUNCTION_MAP_INDEX
-         : STRICT_FUNCTION_MAP_INDEX);
+  static int FunctionMapIndex(StrictMode strict_mode, bool is_generator,
+                              bool is_concise_method) {
+    if (is_generator) {
+      return strict_mode == SLOPPY ? SLOPPY_GENERATOR_FUNCTION_MAP_INDEX
+                                   : STRICT_GENERATOR_FUNCTION_MAP_INDEX;
+    }
+
+    if (is_concise_method) {
+      return strict_mode == SLOPPY
+                 ? SLOPPY_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX
+                 : STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX;
+    }
+
+    return strict_mode == SLOPPY ? SLOPPY_FUNCTION_MAP_INDEX
+                                 : STRICT_FUNCTION_MAP_INDEX;
   }
 
   static const int kSize = kHeaderSize + NATIVE_CONTEXT_SLOTS * kPointerSize;