CMakeChecker takes unusually long time to run

CMakeChecker takes unusually long time to run
https://bugs.webkit.org/show_bug.cgi?id=105662

Reviewed by Ryosuke Niwa.

Move the caching mechanism for regular expression of the C++ checker into
a common file and use it for the CMake and ChangeLog checkers too.

* Scripts/webkitpy/style/checkers/changelog.py:
(ChangeLogChecker.check_entry):
* Scripts/webkitpy/style/checkers/cmake.py:
(CMakeChecker._process_line):
(CMakeChecker._check_no_space_cmds):
(CMakeChecker._check_one_space_cmds):
(CMakeChecker._check_non_lowercase_cmd):
* Scripts/webkitpy/style/checkers/common.py:
(match):
(search):
(searchIgnorecase):
(sub):
(subn):
* Scripts/webkitpy/style/checkers/cpp.py:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@156403 268f45cc-cd09-0410-ab3c-d52691b4dbfc