Change @llvm.clear_cache default to call rt-lib
After some discussion on IRC, emitting a call to the library function seems like a better default, since it will move from a compiler internal error to a linker error, that the user can work around until LLVM is fixed. I'm also adding a note on the responsibility of the user to confirm that the cache was cleared on platforms where nothing is done. llvm-svn: 204806
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