usage: Tool to check where a git commit was merged and reverted.

       [-h] [-g GIT_DIR] hash

positional arguments:
  hash                  Hash of the commit to be searched.

optional arguments:
  -h, --help            show this help message and exit
  -g GIT_DIR, --git-dir GIT_DIR
                        The path to your git working directory.

BUG=

Review URL: https://codereview.chromium.org/1033043002

Cr-Commit-Position: refs/heads/master@{#27563}

tools/release/mergeinfo.py

+#!/usr/bin/env python
+# Copyright 2015 the V8 project authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import argparse
+import os
+import sys
+
+from subprocess import call
+
+def print_analysis(gitWorkingDir, hashToSearch):
+  print '1.) Info'
+  git_execute(gitWorkingDir, ['status'])
+  print '2.) Searching for "' + hashToSearch + '"'
+  print '=====================ORIGINAL COMMIT START====================='
+  git_execute(gitWorkingDir, ['show', hashToSearch])
+  print '=====================ORIGINAL COMMIT END====================='
+  print '#####################FOUND MERGES & REVERTS START#####################'
+  git_execute(gitWorkingDir, ["log",'--all', '--grep='+hashToSearch])
+  print '#####################FOUND MERGES & REVERTS END#####################'
+  print 'Finished successfully'
+
+def git_execute(workingDir, commands):
+  return call(["git", '-C', workingDir] + commands)
+
+if __name__ == "__main__":  # pragma: no cover
+  parser = argparse.ArgumentParser('Tool to check where a git commit was merged and reverted.')
+  parser.add_argument("-g", "--git-dir", required=False, default='.',
+                        help="The path to your git working directory.")
+
+  parser.add_argument('hash', nargs=1, help="Hash of the commit to be searched.")
+
+  args = sys.argv[1:]
+  options = parser.parse_args(args)
+
+  sys.exit(print_analysis(options.git_dir, options.hash[0]))