Consume checker names from clang static analyzer.

Summary: This patch depends on patches D2556 and D2557.

Reviewers: klimek

Reviewed By: klimek

CC: cfe-commits, jordan_rose, krememek

Differential Revision: http://llvm-reviews.chandlerc.com/D2620

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@201221 91177308-0d34-0410-b5e6-96231b3b80d8