Add Windows Hypervisor Platform APIs #977
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It seems that the previous RFC for adding WHP support (#767) has been inactive for a while. So I decided to start a new version.
WHV_UINT128issue: I tried to avoid the unstable ABI problem by not usingu128, but defining a new struct which has the same alignment requirement withu128. Also since#[repr(align(16))]requires Rust 1.25+, an automatic check is added in build.rs so that WinHv is disabled in "everything" on old versions while an explicit turn-on will emit an error.WinHvPlatformDefs.h.Further real testcases are still required.