Fixed compilation time measurement, restructure some code.

runtime/vm/allocation.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_ALLOCATION_H_
 #define VM_ALLOCATION_H_
 
 #include "platform/assert.h"
 #include "vm/base_isolate.h"
 #include "vm/globals.h"
@@ skipping 24 matching lines @@
 // objects location on the stack. Use stack resource objects if objects
 // need to be destroyed even in the case of exceptions when a Longjump is done
 // to a stack frame above the frame where these objects were allocated.
 class StackResource {
  public:
   explicit StackResource(BaseIsolate* isolate)
       : isolate_(isolate), previous_(NULL) {
     // We can only have longjumps and exceptions when there is a current
     // isolate.  If there is no current isolate, we don't need to
     // protect this case.
-    if (isolate) {
+    if (isolate != NULL) {
       previous_ = isolate->top_resource();
       isolate->set_top_resource(this);
     }
   }
 
   virtual ~StackResource() {
-    if (isolate()) {
+    if (isolate() != NULL) {
       StackResource* top = isolate()->top_resource();
       ASSERT(top == this);
       isolate()->set_top_resource(previous_);
     }
 #if defined(DEBUG)
-    BaseIsolate::AssertCurrent(isolate());
+    if (isolate() != NULL) {
+      BaseIsolate::AssertCurrent(isolate());
+    }
 #endif
   }
 
   BaseIsolate* isolate() const { return isolate_; }
 
   // The delete operator should be private instead of public, but unfortunately
   // the compiler complains when compiling the destructors for subclasses.
   void operator delete(void* pointer) { UNREACHABLE(); }
 
  private:
@@ skipping 38 matching lines @@
   // deallocated by invoking DeleteAll() on the zone they live in.
   void operator delete(void* pointer) { UNREACHABLE(); }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ZoneAllocated);
 };
 
 }  // namespace dart
 
 #endif  // VM_ALLOCATION_H_