[api] add API for Promise status and result.

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index 24750cc30ac2f5a1630cc825976f527f27778bdf..745b3915a3df8fab8da265e3f22f58ce4feb1838 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -607,14 +607,6 @@ enum ParseRestriction {
   ONLY_SINGLE_FUNCTION_LITERAL  // Only a single FunctionLiteral expression.
 };
 
-// TODO(gsathya): Move this to JSPromise once we create it.
-// This should be in sync with the constants in promise.js
-enum PromiseStatus {
-  kPromisePending,
-  kPromiseFulfilled,
-  kPromiseRejected,
-};
-
 // A CodeDesc describes a buffer holding instructions and relocation
 // information. The instructions start at the beginning of the buffer
 // and grow forward, the relocation information starts at the end of