Don't assert that no incremental marking happened during a non-incremental GC

If a scavenge is triggered during the GC (via a weak callback or the GC
prologue/epilogue), and another mark-compact is triggered (via the same
unfortunate code path), we end up doing some incremental steps.

BUG=v8:4048
R=dcarney@chromium.org,hpayer@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1096693011

Cr-Commit-Position: refs/heads/master@{#27956}

diff --git a/src/heap/gc-tracer.cc b/src/heap/gc-tracer.cc
index 6f550aa..6f3a03f 100644 (file)
--- a/src/heap/gc-tracer.cc
+++ b/src/heap/gc-tracer.cc
@@ -218,7 +218,7 @@ void GCTracer::Stop(GarbageCollector collector) {
     DCHECK(current_.incremental_marking_bytes == 0);
     DCHECK(current_.incremental_marking_duration == 0);
     DCHECK(current_.pure_incremental_marking_duration == 0);
-    DCHECK(longest_incremental_marking_step_ == 0.0);
+    longest_incremental_marking_step_ = 0.0;
     mark_compactor_events_.push_front(current_);
   }