[clang-tidy] Fix sed flag.

GNU sed does not recognize -E. Use -r that is supported by
both BSD and GNU instead.


git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@215163 91177308-0d34-0410-b5e6-96231b3b80d8
[clang-tidy] Fix sed flag again

Darwin's sed does not recognize -r to tell the tool that the
expression is the extended regexp. Seems we don't really need
the flag, as the expression is valid as the standard regexp.
Removing the flag.



git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@215171 91177308-0d34-0410-b5e6-96231b3b80d8