Safer interface for heap iteration.

runtime/vm/pages.cc

Index: runtime/vm/pages.cc
diff --git a/runtime/vm/pages.cc b/runtime/vm/pages.cc
index 18eec36fe8a23a9102705f2b4ebeb7f99636d6cb..a5f6203ac921dddcdaef76552bf9004dec8a8b01 100644
--- a/runtime/vm/pages.cc
+++ b/runtime/vm/pages.cc
@@ -778,7 +778,7 @@ void PageSpace::MarkSweep(bool invoke_api_callbacks) {
 
   if (FLAG_verify_before_gc) {
     OS::PrintErr("Verifying before marking...");
-    heap_->Verify();
+    heap_->VerifyGC();
     OS::PrintErr(" done.\n");
   }
 
@@ -810,7 +810,7 @@ void PageSpace::MarkSweep(bool invoke_api_callbacks) {
   {
     if (FLAG_verify_before_gc) {
       OS::PrintErr("Verifying before sweeping...");
-      heap_->Verify(kAllowMarked);
+      heap_->VerifyGC(kAllowMarked);
       OS::PrintErr(" done.\n");
     }
     GCSweeper sweeper;
@@ -871,7 +871,7 @@ void PageSpace::MarkSweep(bool invoke_api_callbacks) {
       }
       if (FLAG_verify_after_gc) {
         OS::PrintErr("Verifying after sweeping...");
-        heap_->Verify(kForbidMarked);
+        heap_->VerifyGC(kForbidMarked);
         OS::PrintErr(" done.\n");
       }
     } else {