Fix build with GCC 4.6.

Fix build with GCC 4.6 after 158a8765.

BUG=

Review URL: https://codereview.chromium.org/908713002

Cr-Commit-Position: refs/heads/master@{#26513}

src/globals.h

@@ -821,7 +821,7 @@ enum FunctionKind {
   kAccessorFunction = 1 << 3,
   kDefaultConstructor = 1 << 4,
   kSubclassConstructor = 1 << 5,
-  kBaseConstructor = 1 << 6,
+  kBaseConstructor = 1 << 6
 };