ES6: Add support for method shorthand in object literals

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 055bfdbe021191eb4e0cfeef8d049eba2fc163e8..a13f355a3ab8912a944b5daf04601b9a844787e6 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7208,6 +7208,9 @@ class SharedFunctionInfo: public HeapObject {
   // Indicates that this function is an arrow function.
   DECL_BOOLEAN_ACCESSORS(is_arrow)
 
+  // Indicates that this function is a concise method.
+  DECL_BOOLEAN_ACCESSORS(is_concise_method)
+
   // Indicates whether or not the code in the shared function support
   // deoptimization.
   inline bool has_deoptimization_support();
@@ -7404,6 +7407,7 @@ class SharedFunctionInfo: public HeapObject {
     kDontFlush,
     kIsGenerator,
     kIsArrow,
+    kIsConciseMethod,
     kCompilerHintsCount  // Pseudo entry
   };