Rename llvmc2/core to llvmc2/driver.

Makefiles try to remove 'core' by default, so it wasn't a very good name.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57031 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed