Wrap TSX intrinsics with checks on compiler and architecture support for TSX.
Summary: The TSX intrinsics should only be compiled and used when compilers and platforms support them. This diff wraps the intrinsics and adds checks on TSX support to server this purpose. Reviewed By: nbronson Differential Revision: D16585187 fbshipit-source-id: 6490c0da7f6221caaa4529bfcebb261cfd99cc7d
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