Basic support for diagnostics.

Summary: Uses DiagnosticsEngine to output diagnostics.

Reviewers: djasper, klimek

Reviewed By: djasper

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D278

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172071 91177308-0d34-0410-b5e6-96231b3b80d8
Fixes layout of right braces.

We now decide whether a newline should go before the closing brace
depending on whether a newline was inserted after the opening brace.

For example, we now insert a newline before '};' in:
static SomeClass WithALoooooooooooooooooooongName = {
  100000000, \"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\"
};
... while not inserting a newline here:
static SomeClass = { a, b, c, d, e, f, g, h, i, j,
                     looooooooooooooooooooooooooooooooooongname,
                     looooooooooooooooooooooooooooooong };

Also fixes the formating of (column limit 25):
int x = {
  avariable,
  b(alongervariable)
};

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172076 91177308-0d34-0410-b5e6-96231b3b80d8