Add support for static analysis to clang-check

Summary:
This adds a command line argument '-analyze' to clang-check which runs the
clang static analyzer on the source files.

Reviewers: klimek

CC: cfe-commits, revane

Differential Revision: http://llvm-reviews.chandlerc.com/D926
[ASan] lit tests: create common autogenerated config for running compiler-rt lit tests, and use it in ASan