Fix a regression of df7473673214.
cmake MSVC generator is multiple configurations. Build type is not known
at configure time and CMAKE_CFG_INTDIR is evaluated to $(Configuration)
at configure time. libclc install fails since $(Configuration) in
bitcode file path is unresolved in libclc/cmake_install.cmake at install time.
We need a solution that resolves libclc bitcode file path at install
time. This PR fixes the issue using CMAKE_INSTALL_CONFIG_NAME which can
be evaluated at install time. This is the same solution as in
https://reviews.llvm.org/D76827
68c609b6c8