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[Driver] Use libatomic for 32-bit SPARC atomics support on Linux
This is the Linux/sparc64 equivalent to D118021 <https://reviews.llvm.org/D118021>, necessary to provide an external implementation of atomics on 32-bit SPARC which LLVM cannot inline even with `-mcpu=v9` or an equivalent default. Tested on `sparc64-unknown-linux-gnu`. Differential Revision: https://reviews.llvm.org/D130569
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