Revert "Updated MallocHooks to collect stack traces when memory is allocated."

runtime/vm/os_android.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_ANDROID)
 
 #include "vm/os.h"
 
 #include <android/log.h>   // NOLINT
@@ skipping 258 matching lines @@
     req = rem;
   }
 }
 
 
 void OS::DebugBreak() {
   __builtin_trap();
 }
 
 
-uintptr_t DART_NOINLINE OS::GetProgramCounter() {
-  return reinterpret_cast<uintptr_t>(
-      __builtin_extract_return_addr(__builtin_return_address(0)));
-}
-
-
 char* OS::StrNDup(const char* s, intptr_t n) {
   return strndup(s, n);
 }
 
 
 intptr_t OS::StrNLen(const char* s, intptr_t n) {
   return strnlen(s, n);
 }
 
 
@@ skipping 149 matching lines @@
 }
 
 
 void OS::Exit(int code) {
   exit(code);
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_ANDROID)