Switch SetupIsolateForProfiling to use calloc instead of new []

runtime/vm/profiler.cc

 // Copyright (c) 2013, 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.
 
 #include <cstdio>
 
 #include "platform/utils.h"
 
 #include "vm/isolate.h"
 #include "vm/json_stream.h"
@@ skipping 561 matching lines @@
   }
   vm_tags = kIdle;
   runtime_tags = 0;
 }
 
 
 SampleBuffer::SampleBuffer(intptr_t capacity) {
   start_ = 0;
   end_ = 0;
   capacity_ = capacity;
-  samples_ = new Sample[capacity];
+  samples_ = reinterpret_cast<Sample*>(calloc(capacity, sizeof(Sample)));
 }
 
 
 SampleBuffer::~SampleBuffer() {
   if (samples_ != NULL) {
-    delete[] samples_;
+    free(samples_);
     samples_ = NULL;
+    start_ = 0;
+    end_ = 0;
+    capacity_ = 0;
   }
 }
 
 
 Sample* SampleBuffer::ReserveSample() {
   ASSERT(samples_ != NULL);
   intptr_t index = end_;
   end_ = WrapIncrement(end_);
   if (end_ == start_) {
     start_ = WrapIncrement(start_);
@@ skipping 98 matching lines @@
     return false;
   }
   uintptr_t cursor = reinterpret_cast<uintptr_t>(fp);
   cursor += sizeof(fp);
   bool r = cursor >= lower_bound_ && cursor < stack_upper_;
   return r;
 }
 
 
 }  // namespace dart