177b978f71
When the HIP compiler set to a symblink that was created outside
/opt/rocm/llvm/bin, HIP's cmake would get HIP_CLANG_ROOT incorrectly.
This teaches hip-config to get clang's real path first and use that to determine LLVM's directory.
Change-Id: I6275b67f843aff256dc72cf478e575224e0cedc3
[ROCm/clr commit: e70d7374ef]