Reland Create JSPromise (patchset #16 id:300001 of https://codereview.chromium.org/2536463002/ )"

src/objects.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <memory>
 #include <sstream>
@@ skipping 16429 matching lines @@
     return array;
   }
 
  private:
   Handle<String> source_;
   Handle<SharedFunctionInfo> shared_;
   LanguageMode language_mode_;
   int scope_position_;
 };
 
+// static
+const char* JSPromise::Status(int status) {
+  switch (status) {
+    case kPromiseFulfilled:
+      return "resolved";
+    case kPromisePending:
+      return "pending";
+    case kPromiseRejected:
+      return "rejected";
+  }
+  UNREACHABLE();
+  return NULL;
+}
 
 namespace {
 
 JSRegExp::Flags RegExpFlagsFromString(Handle<String> flags, bool* success) {
   JSRegExp::Flags value = JSRegExp::kNone;
   int length = flags->length();
   // A longer flags string cannot be valid.
   if (length > 5) return JSRegExp::Flags(0);
   for (int i = 0; i < length; i++) {
     JSRegExp::Flag flag = JSRegExp::kNone;
@@ skipping 3933 matching lines @@
       // depend on this.
       return DICTIONARY_ELEMENTS;
     }
     DCHECK_LE(kind, LAST_ELEMENTS_KIND);
     return kind;
   }
 }
 
 }  // namespace internal
 }  // namespace v8