Use os.path.realpath when tracking the cwd.
This is needed by TestCases/Posix/coverage-direct.cc
The problem is that the test does:
mkdir <dir>
cd <dir>
cd ..
rm -rf <dir>
<more commands>
the current directory currently looks like "/.../<dir>/../" which
doesn't exist when dir is deleted.
at some point we should probably switch to using the os current
directory (specially if we want to add subshell), but this is a small
incremental improvement.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@299113
91177308-0d34-0410-b5e6-
96231b3b80d8