Attempt to print the stack using the profiler upon assertion failure.

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 "platform/address_sanitizer.h"
 #include "platform/memory_sanitizer.h"
 #include "platform/utils.h"
 
 #include "vm/allocation.h"
 #include "vm/atomic.h"
@@ skipping 322 matching lines @@
 static void DumpStackFrame(intptr_t frame_index, uword pc) {
   uintptr_t start = 0;
   char* native_symbol_name =
       NativeSymbolResolver::LookupSymbolName(pc, &start);
   if (native_symbol_name == NULL) {
     OS::Print("Frame[%" Pd "] = `unknown symbol` [0x%" Px "]\n",
               frame_index, pc);
   } else {
     OS::Print("Frame[%" Pd "] = `%s` [0x%" Px "]\n",
               frame_index, native_symbol_name, pc);
-    free(native_symbol_name);
+    NativeSymbolResolver::FreeSymbolName(native_symbol_name);
   }
 }
 
 
 static void DumpStackFrame(intptr_t frame_index,
                            uword pc,
                            const Code& code) {
   if (code.IsNull()) {
     DumpStackFrame(frame_index, pc);
   } else {
@@ skipping 1225 matching lines @@
 
 
 ProcessedSampleBuffer::ProcessedSampleBuffer()
     : code_lookup_table_(new CodeLookupTable(Thread::Current())) {
   ASSERT(code_lookup_table_ != NULL);
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart