v8: backport 4f82f1d948c from upstream v8

Original commit message:
    [PATCH] Rename idle garbage collection callback flag.

    TBR=mlippautz@chromium.org

    Review-Url: https://codereview.chromium.org/2867863002
    Cr-Commit-Position: refs/heads/master@{#45173}

PR-URL: #13217
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>

deps/v8/include/v8.h

@@ -6015,7 +6015,7 @@ enum GCType {
  *   - kGCCallbackFlagCollectAllAvailableGarbage: The GC callback is called
  *     in a phase where V8 is trying to collect all available garbage
  *     (e.g., handling a low memory notification).
- *   - kGCCallbackScheduleIdleCollectGarbage: The GC callback is called to
+ *   - kGCCallbackScheduleIdleGarbageCollection: The GC callback is called to
  *     trigger an idle garbage collection.
  */
 enum GCCallbackFlags {
@@ -6025,7 +6025,7 @@ enum GCCallbackFlags {
   kGCCallbackFlagSynchronousPhantomCallbackProcessing = 1 << 3,
   kGCCallbackFlagCollectAllAvailableGarbage = 1 << 4,
   kGCCallbackFlagCollectAllExternalMemory = 1 << 5,
-  kGCCallbackScheduleIdleCollectGarbage = 1 << 6,
+  kGCCallbackScheduleIdleGarbageCollection = 1 << 6,
 };
 
 typedef void (*GCCallback)(GCType type, GCCallbackFlags flags);