Remove from the CFG the half-implemented support for scoping information. We...

Remove from the CFG the half-implemented support for scoping information.  We decided that scope information doesn't belong in the CFG at all, since it is a lexical construct.

Patch by Marcin Świderski!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@113798 91177308-0d34-0410-b5e6-96231b3b80d8