For PR432:

For PR432:
Rework the CFE build details to include the directions for using the
option --program-prefix=llvm- to the CFE's configure script. This ensures
that the CFE builds unique executable names and makes it possible to put
the $CFEINSTALL/bin directory into one's path.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19099 91177308-0d34-0410-b5e6-96231b3b80d8