Fix Linux perf profiling support.

runtime/vm/os_linux.cc

 // 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.
 
 #include "vm/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include "vm/os.h"
 
 #include <errno.h>  // NOLINT
@@ skipping 114 matching lines @@
 class PerfCodeObserver : public CodeObserver {
  public:
   PerfCodeObserver() {
     Dart_FileOpenCallback file_open = Isolate::file_open_callback();
     if (file_open == NULL) {
       return;
     }
     const char* format = "/tmp/perf-%"Pd".map";
     intptr_t pid = getpid();
     intptr_t len = OS::SNPrint(NULL, 0, format, pid);
-    char* filename = Isolate::Current()->current_zone()->Alloc<char>(len + 1);
+    char* filename = new char[len + 1];
     OS::SNPrint(filename, len + 1, format, pid);
     out_file_ = (*file_open)(filename, true);
+    delete[] filename;
   }
 
   ~PerfCodeObserver() {
     Dart_FileCloseCallback file_close = Isolate::file_close_callback();
     if (file_close == NULL) {
       return;
     }
     ASSERT(out_file_ != NULL);
     (*file_close)(out_file_);
   }
@@ skipping 375 matching lines @@
 }
 
 
 void OS::Exit(int code) {
   exit(code);
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)