[heap] GCTracer: Account for sweeping during incremental marking

src/heap/gc-tracer.h

Index: src/heap/gc-tracer.h
diff --git a/src/heap/gc-tracer.h b/src/heap/gc-tracer.h
index a11823e984f63ba1f25c3ddcca0c607e81571b50..1b5dea339c314af16c11084b364f626198ab532c 100644
--- a/src/heap/gc-tracer.h
+++ b/src/heap/gc-tracer.h
@@ -63,6 +63,7 @@ enum ScavengeSpeedMode { kForAllObjects, kForSurvivedObjects };
 #define INCREMENTAL_SCOPES(F)                                      \
   /* MC_INCREMENTAL is the top-level incremental marking scope. */ \
   F(MC_INCREMENTAL)                                                \
+  F(MC_INCREMENTAL_SWEEPING)                                       \
   F(MC_INCREMENTAL_WRAPPER_PROLOGUE)                               \
   F(MC_INCREMENTAL_WRAPPER_TRACING)                                \
   F(MC_INCREMENTAL_FINALIZE)                                       \