[clang-format] Continue after non-scope-closers in getLengthToMatchingParen

Summary:
This fixes a regression introduced by `r331857` where we stop the search for
the End token as soon as we hit a non-scope-closer, which prematurely stops before
semicolons for example, which should otherwise be considered as part of the unbreakable tail.

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D46824

llvm-svn: 332225