Add gdb helper functions for creating a handle and using ToCString with RawObjects.

runtime/BUILD.gn

 # Copyright (c) 2014, 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.
 
 import("runtime_args.gni")
 
 declare_args() {
   # Instead of using is_debug, we introduce a different flag for specifying a
   # Debug build of Dart so that clients can still use a Release build of Dart
   # while themselves doing a Debug build.
@@ skipping 241 matching lines @@
 libdart_library("libdart_with_precompiler") {
   extra_configs = [ ":dart_precompiler_config" ]
   extra_deps = [
     "vm:libdart_lib_with_precompiler",
     "vm:libdart_vm_with_precompiler",
   ]
 }
 
 action("generate_version_cc_file") {
   deps = [
-    ":libdart_dependency_helper",
+    "third_party/double-conversion/src:libdouble_conversion",
+    "vm:libdart_lib_jit",
+    "vm:libdart_lib_nosnapshot_with_precompiler",
+    "vm:libdart_vm_jit",
+    "vm:libdart_vm_nosnapshot_with_precompiler",
   ]
   inputs = [
     "../tools/utils.py",
     "../tools/print_version.py",
     "../tools/VERSION",
     "vm/version_in.cc",
   ]
   output = "$target_gen_dir/version.cc"
   outputs = [
     output,
   ]
 
   script = "../tools/make_version.py"
   args = [
     "--quiet",
     "--output",
     rebase_path(output, root_build_dir),
     "--input",
     rebase_path("vm/version_in.cc", root_build_dir),
   ]
 }
-
-executable("libdart_dependency_helper") {
-  configs += [
-    ":dart_config",
-    ":dart_maybe_product_config",
-  ]
-  if (is_fuchsia) {
-    configs -= [ "//build/config:symbol_visibility_hidden" ]
-  }
-  deps = [
-    "third_party/double-conversion/src:libdouble_conversion",
-    "vm:libdart_lib_jit",
-    "vm:libdart_lib_nosnapshot_with_precompiler",
-    "vm:libdart_vm_jit",
-    "vm:libdart_vm_nosnapshot_with_precompiler",
-  ]
-  sources = [
-    "vm/libdart_dependency_helper.cc",
-  ]
-}