Oilpan: Query stack frame register instead of manual bookkeeping

Source/platform/heap/Heap.cpp

Index: Source/platform/heap/Heap.cpp
diff --git a/Source/platform/heap/Heap.cpp b/Source/platform/heap/Heap.cpp
index 01d82954d22964642466108e61b46867b232d9da..23ba3ac686328e3d342bff436d51d8af20c84ae2 100644
--- a/Source/platform/heap/Heap.cpp
+++ b/Source/platform/heap/Heap.cpp
@@ -2272,6 +2272,8 @@ void Heap::collectGarbage(ThreadState::StackState stackState, ThreadState::GCTyp
     ThreadState::NoAllocationScope noAllocationScope(state);
 
     preGC();
+    s_markingVisitor->configureEagerTraceLimit();
+    ASSERT(s_markingVisitor->canTraceEagerly());
 
     Heap::resetMarkedObjectSize();
     Heap::resetAllocatedObjectSize();
@@ -2328,6 +2330,7 @@ void Heap::collectGarbageForTerminatingThread(ThreadState* state)
         ThreadState::NoAllocationScope noAllocationScope(state);
 
         state->preGC();
+        s_markingVisitor->configureEagerTraceLimit();
 
         // 1. Trace the thread local persistent roots. For thread local GCs we
         // don't trace the stack (ie. no conservative scanning) since this is