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When cross-compiling a Windows clang with `-DLLVM_BUILD_INSTRUMENTED`, the profiling compiler-rt is linked to binaries, as one would expect, but the profiling compiler-rt contains objects with `/DEFAULTLIB:LIBCMT` and `/DEFAULTLIB:OLDNAMES` directives, which makes the build expect `LIBCMT.lib` and `OLDNAMES.lib`, but they are nowhere to be found because they are in lowercase. While the WinMsvc.cmake helper recreates symbolic links to work around such case sensitivity issues for the Windows SDK libs, it doesn't do so for the MSVC libs, which we add here.
See docs/CMake.html for instructions on how to build LLVM with CMake.