[AArch64][Clang][Linux] Enable out-of-line atomics by default.Generate outline atomics if compiling for armv8-a non-LSE AArch64 Linux(including Android) targets to use LSE instructions, if they ar
[AArch64][Clang][Linux] Enable out-of-line atomics by default.Generate outline atomics if compiling for armv8-a non-LSE AArch64 Linux(including Android) targets to use LSE instructions, if they are available,at runtime. Library support is checked by clang driver which doesn't enableoutline atomics if no proper libraries (libgcc >= 9.3.1 or compiler-rt) found.Differential Revision: https://reviews.llvm.org/D93585
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