Put newspace evacuation in an EvacuationScope

BUG=chromium:471554
LOG=y
R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/1050493002

Cr-Commit-Position: refs/heads/master@{#27539}

src/heap/mark-compact.cc

@@ -3698,6 +3698,7 @@ void MarkCompactCollector::EvacuateNewSpaceAndCandidates() {
     GCTracer::Scope gc_scope(heap()->tracer(),
                              GCTracer::Scope::MC_SWEEP_NEWSPACE);
     code_slots_filtering_required = MarkInvalidatedCode();
+    EvacuationScope evacuation_scope(this);
     EvacuateNewSpace();
   }
 
@@ -3706,6 +3707,11 @@ void MarkCompactCollector::EvacuateNewSpaceAndCandidates() {
                              GCTracer::Scope::MC_EVACUATE_PAGES);
     EvacuationScope evacuation_scope(this);
     EvacuatePages();
+#ifdef VERIFY_HEAP
+    if (FLAG_verify_heap && !sweeping_in_progress_) {
+      VerifyEvacuation(heap());
+    }
+#endif
   }
 
   // Second pass: find pointers to new space and update them.