Reintegrated SAFECode into Clang.
Patch by Joshua Cranmer with minor modifications by me.
This patch passes all the lit tests except the regression tests which fail
due to a change in how lit works.


git-svn-id: http://llvm.org/svn/llvm-project/safecode/trunk@189071 91177308-0d34-0410-b5e6-96231b3b80d8