Renamed class GRConstants => GRExprEngine.
This was done with a Perl script, and will result in 80 col. violations that
I will gradually fix up.
llvm-svn: 47070
have been visited in a path. Added GRBlockCounter as an item to be
enqueued to the worklist.
Modified "ProcessBranch" in GRConstants to prune branches with symbolic
conditions that have been already taken.
llvm-svn: 47010