Put the GDB symbols stuff under conditional compile.

runtime/vm/gdbjit_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 <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 
 #include "vm/gdbjit_android.h"
 
@@ skipping 13 matching lines @@
 
   struct jit_descriptor {
     uint32_t version;
     /* This type should be jit_actions_t, but we use uint32_t
        to be explicit about the bitwidth.  */
     uint32_t action_flag;
     struct jit_code_entry* relevant_entry;
     struct jit_code_entry* first_entry;
   };
 
+#ifndef GDB_JIT_SYMBOLS
   /* GDB puts a breakpoint in this function.  */
   void __attribute__((noinline)) __jit_debug_register_code() { }
 
   /* Make sure to specify the version statically, because the
      debugger may check the version before we can set it.  */
   struct jit_descriptor __jit_debug_descriptor = { 1, 0, 0, 0 };
+#endif
 
   static struct jit_code_entry* first_dynamic_region = NULL;
   static struct jit_code_entry* last_dynamic_region = NULL;
 
   void addDynamicSection(const char* symfile_addr, uint64_t symfile_size) {
     jit_code_entry* new_entry = reinterpret_cast<jit_code_entry*>(
         malloc(sizeof(jit_code_entry)));
     if (new_entry != NULL) {
       new_entry->symfile_addr = symfile_addr;
       new_entry->symfile_size = symfile_size;
@@ skipping 18 matching lines @@
       __jit_debug_descriptor.action_flag = JIT_UNREGISTER_FN;
       __jit_debug_descriptor.relevant_entry = iterator;
       __jit_debug_descriptor.first_entry = first_dynamic_region;
       __jit_debug_register_code();
       iterator = iterator->prev_entry;
     }
     first_dynamic_region = NULL;
     last_dynamic_region = NULL;
   }
 };