Bug 1510128 - Exclude irregexp from reformatting r=Ehsan

Differential Revision: https://phabricator.services.mozilla.com/D13062

--HG--
extra : moz-landing-system : lando

.clang-format-ignore

@@ -14,9 +14,8 @@ ipc/testshell/.*
 # Generated code
 js/src/builtin/intl/TimeZoneDataGenerated.h
 
-# Generated by js/src/util/make_unicode.py
-js/src/irregexp/RegExpCharacters-inl.h
-js/src/irregexp/RegExpCharacters.cpp
+# Don't want to reformat irregexp. bug 1510128
+js/src/irregexp/.*
 js/src/util/Unicode.cpp
 js/src/util/UnicodeNonBMP.h