[analyzer] Propagate the checker's state from checkBranchCondition

Fixes a bug, where we were dropping the state modifications from the
checkBranchCondition checker callback.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@170232 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed