Change to X64 default build in tool scripts in sdk/bin

sdk/bin/dartfmt

 #!/bin/bash
 # 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.
 
 # Run dart_style/bin/format.dart on the Dart VM. This script assumes the Dart
 # repo's directory structure.
 
 function follow_links() {
   file="$1"
@@ skipping 12 matching lines @@
 SDK_DIR="$(cd "${BIN_DIR}/.." ; pwd -P)"
 
 DART="$BIN_DIR/dart"
 
 DART_ROOT="$(cd "${SDK_DIR}/.." ; pwd -P)"
 
 DARTFMT="$DART_ROOT/third_party/pkg_tested/dart_style/bin/format.dart"
 
 if [ -z "$DART_CONFIGURATION" ];
 then
-  DART_CONFIGURATION="ReleaseIA32"
+  DART_CONFIGURATION="ReleaseX64"

[Søren Gjesse, 2015/12/17 12:08:34]

Why is this not trying different configurations as the other Linux scripts?

 fi
 
 if [[ `uname` == 'Darwin' ]]; then
   BUILD_DIR="$DART_ROOT/xcodebuild/$DART_CONFIGURATION"
 else
   BUILD_DIR="$DART_ROOT/out/$DART_CONFIGURATION"
 fi
 
 PACKAGE_ROOT="$BUILD_DIR/packages/"
 
 exec "$DART" "--package-root=$PACKAGE_ROOT" "$DARTFMT" "$@"