Summary:
This patch adds a NamespaceEndCommentsFixer TokenAnalyzer for clang-format,
which fixes end namespace comments.
It currently supports inserting and updating existing wrong comments.
Example source:
```
namespace A {
int i;
}
namespace B {
int j;
} // namespace A
```
after formatting:
```
namespace A {
int i;
} // namespace A
namespace B {
int j;
} // namespace B
```
Reviewers: klimek, djasper
Reviewed By: djasper
Subscribers: klimek, mgorny
Differential Revision: https://reviews.llvm.org/D30269
llvm-svn: 296341
Krasimir Georgiev