[heap] MinorMC: Only iterate new space global handles for ptr updates

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index a7dfb80e5ac3a0face4bcf92b02c8a861a4cffff..06aa13d2c421098c10b77dabcd6dea6ad9bf79ba 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -5108,7 +5108,7 @@ void Heap::IterateStrongRoots(RootVisitor* v, VisitMode mode) {
   // Iterate over the builtin code objects and code stubs in the
   // heap. Note that it is not necessary to iterate over code objects
   // on scavenge collections.
-  if (mode != VISIT_ALL_IN_SCAVENGE) {
+  if (mode != VISIT_ALL_IN_SCAVENGE && mode != VISIT_ALL_IN_MINOR_MC_UPDATE) {
     isolate_->builtins()->IterateBuiltins(v);
     v->Synchronize(VisitorSynchronization::kBuiltins);
     isolate_->interpreter()->IterateDispatchTable(v);
@@ -5128,6 +5128,9 @@ void Heap::IterateStrongRoots(RootVisitor* v, VisitMode mode) {
     case VISIT_ALL_IN_SCAVENGE:
       isolate_->global_handles()->IterateNewSpaceStrongAndDependentRoots(v);
       break;
+    case VISIT_ALL_IN_MINOR_MC_UPDATE:
+      isolate_->global_handles()->IterateAllNewSpaceRoots(v);
+      break;
     case VISIT_ALL_IN_SWEEP_NEWSPACE:
     case VISIT_ALL:
       isolate_->global_handles()->IterateAllRoots(v);
@@ -5136,7 +5139,7 @@ void Heap::IterateStrongRoots(RootVisitor* v, VisitMode mode) {
   v->Synchronize(VisitorSynchronization::kGlobalHandles);
 
   // Iterate over eternal handles.
-  if (mode == VISIT_ALL_IN_SCAVENGE) {
+  if (mode == VISIT_ALL_IN_SCAVENGE || mode == VISIT_ALL_IN_MINOR_MC_UPDATE) {
     isolate_->eternal_handles()->IterateNewSpaceRoots(v);
   } else {
     isolate_->eternal_handles()->IterateAllRoots(v);