Append appropriate -rpath when using shared compiler-rt runtimes,
e.g. '-fsanitize=address -shared-libasan'. There's already a similar
logic in CommonArgs.cpp but it uses non-standard arch-suffixed
installation directory while we want our driver to work with standard
installation paths.
Differential Revision: https://reviews.llvm.org/D57303
llvm-svn: 352610
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optimizers, and runtime environments.