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[compiler-rt][XRay] Address follow-up comments to initial interface a…
…nd initialisation code This addresses some comments from D21612, which contains the following changes: - Update __xray_patch() and __xray_unpatch() API documentation to not imply asynchrony. - Introduce a scope cleanup mechanism to make sure we can roll-back changes to the XRayPatching global atomic. - Introduce a few more comments for potential extension points for other platforms (for the implementation details of patching and un-patching). Reviewers: eugenis, rnk, kcc, echristo, majnemer Subscribers: llvm-commits, mehdi_amini Differential Revision: https://reviews.llvm.org/D22911 llvm-svn: 277124
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