Bug 964214 - Don't wait for background sweep to finish for minor GC r=terrence

js/src/gc/Nursery.cpp

@@ -689,10 +689,6 @@ js::Nursery::collect(JSRuntime *rt, JS::gcreason::Reason reason, TypeObjectList
 
     AutoStopVerifyingBarriers av(rt, false);
 
-    TIME_START(waitBgSweep);
-    rt->gcHelperThread.waitBackgroundSweepEnd();
-    TIME_END(waitBgSweep);
-
     /* Move objects pointed to by roots from the nursery to the major heap. */
     MinorCollectionTracer trc(rt, this);
 
@@ -813,18 +809,17 @@ js::Nursery::collect(JSRuntime *rt, JS::gcreason::Reason reason, TypeObjectList
         static bool printedHeader = false;
         if (!printedHeader) {
             fprintf(stderr,
-                    "MinorGC: Reason               PRate  Size Time   WaitBg mkVals mkClls mkSlts mkWCll mkRVal mkRCll mkGnrc ckTbls mkRntm mkDbgr clrNOC collct updtIn resize pretnr frSlts clrSB  sweep\n");
+                    "MinorGC: Reason               PRate  Size Time   mkVals mkClls mkSlts mkWCll mkRVal mkRCll mkGnrc ckTbls mkRntm mkDbgr clrNOC collct updtIn resize pretnr frSlts clrSB  sweep\n");
             printedHeader = true;
         }
 
 #define FMT " %6" PRIu64
         fprintf(stderr,
-                "MinorGC: %20s %5.1f%% %4d" FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT "\n",
+                "MinorGC: %20s %5.1f%% %4d" FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT FMT "\n",
                 js::gcstats::ExplainReason(reason),
                 promotionRate * 100,
                 numActiveChunks_,
                 totalTime,
-                TIME_TOTAL(waitBgSweep),
                 TIME_TOTAL(markValues),
                 TIME_TOTAL(markCells),
                 TIME_TOTAL(markSlots),