Revert "[VFS] Add "expand tilde" argument to getRealPath."

This reverts commit r346453.
This is a complex change to a widely-used interface, and was not reviewed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346500 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed