Make clang-format cleaner remove redundant commas in list and redundant colon...

Make clang-format cleaner remove redundant commas in list and redundant colon in constructor initializer.

Summary: Make clang-format cleaner remove redundant commas/colons in constructor initializer list.

Reviewers: klimek, djasper

Subscribers: cfe-commits, klimek

Differential Revision: http://reviews.llvm.org/D19804

llvm-svn: 269888