First part of inspecting local variables

runtime/vm/raw_object.cc

Index: runtime/vm/raw_object.cc
===================================================================
--- runtime/vm/raw_object.cc	(revision 2646)
+++ runtime/vm/raw_object.cc	(working copy)
@@ -128,6 +128,13 @@
         instance_size = PcDescriptors::InstanceSize(num_descriptors);
         break;
       }
+      case kLocalVarDescriptors: {
+        const RawLocalVarDescriptors* raw_descriptors =
+            reinterpret_cast<const RawLocalVarDescriptors*>(this);
+        intptr_t num_descriptors = raw_descriptors->ptr()->length_;
+        instance_size = LocalVarDescriptors::InstanceSize(num_descriptors);
+        break;
+      }
       case kExceptionHandlers: {
         const RawExceptionHandlers* raw_handlers =
             reinterpret_cast<const RawExceptionHandlers*>(this);
@@ -351,6 +358,15 @@
 }
 
 
+intptr_t RawLocalVarDescriptors::VisitLocalVarDescriptorsPointers(
+    RawLocalVarDescriptors* raw_obj, ObjectPointerVisitor* visitor) {
+  RawLocalVarDescriptors* obj = raw_obj->ptr();
+  intptr_t len = obj->length_;
+  visitor->VisitPointer(reinterpret_cast<RawObject**>(&obj->names_));
+  return LocalVarDescriptors::InstanceSize(len);
+}
+
+
 intptr_t RawExceptionHandlers::VisitExceptionHandlersPointers(
     RawExceptionHandlers* raw_obj, ObjectPointerVisitor* visitor) {
   RawExceptionHandlers* obj = raw_obj->ptr();