Keep track of indentation levels in static initializers for correct indentation with tabs.

Summary:
Store IndentationLevel in ParentState and use it instead of the
Line::Level when indening.
Also fixed incorrect indentation level calculation in formatFirstToken.

Reviewers: djasper

Reviewed By: djasper

CC: cfe-commits, klimek

Differential Revision: http://llvm-reviews.chandlerc.com/D1797

llvm-svn: 192563