Bug 1420538 - Bailout from triggerZoneGC when the heap is busy r=jonco

--HG--
extra : rebase_source : 2b6640538f03608758f70355c82c6a42534ba148

js/src/jsgc.cpp

@@ -3275,7 +3275,7 @@ GCRuntime::triggerZoneGC(Zone* zone, JS::gcreason::Reason reason, size_t used, s
     MOZ_ASSERT(CurrentThreadCanAccessRuntime(rt));
 
     /* GC is already running. */
-    if (JS::CurrentThreadIsHeapCollecting())
+    if (JS::CurrentThreadIsHeapBusy())
         return false;
 
 #ifdef JS_GC_ZEAL