Add SIMD support to context switches#6
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By default, the context switching that the earlier code implements is intended to be light. In other words, it only saves what is absolutely necessary to save.
Unfortunately, properly testing this feature requires more assembly, though it is done. SIMD is verifiably saved across stack switches using SIMDGuard. Some changes were made to make the test pass, namely the fact that the simd_buffer_ is now allocated using `std::aligned_alloc` because `xsave` was originally segfaulting.
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loom::SwitchStackis only designed to save what is absolutely necessary to save.SIMDGuardis designed to save everything else so that SIMD applications can safely yield execution while working.