[promises] Move promise constants to macros.py.

This should recover part of the Bluebird regression caused by
sending let/const to TurboFan+Ignition.

R=gsathya@chromium.org

Review-Url: https://codereview.chromium.org/2552583002
Cr-Commit-Position: refs/heads/master@{#41467}

src/js/macros.py

@@ -197,3 +197,12 @@ define kArrayInstanceConstructorModified = 28;
 define kLegacyFunctionDeclaration = 29;
 define kRegExpPrototypeSourceGetter = 30;
 define kRegExpPrototypeOldFlagGetter = 31;
+
+# [[PromiseState]] values:
+# These values should be kept in sync with PromiseStatus in globals.h
+define kPending = 0;
+define kFulfilled = 1;
+define kRejected = 2;
+
+define kResolveCallback = 0;
+define kRejectCallback = 1;

src/js/promise.js

@@ -44,15 +44,6 @@ utils.Import(function(from) {
 
 // -------------------------------------------------------------------
 
-// [[PromiseState]] values:
-// These values should be kept in sync with PromiseStatus in globals.h
-const kPending = 0;
-const kFulfilled = +1;
-const kRejected = +2;
-
-const kResolveCallback = 0;
-const kRejectCallback = 1;
-
 // Core functionality.
 
 function PromiseSet(promise, status, value) {