[5.3] Add all the ptrauth IR attributes that Clang does #31963
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A more modest fix for rdar://63289339 for the 5.3 release.
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tkremenek
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Jun 10, 2020
AnthonyLatsis
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🍒 release cherry pick
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A more modest fix for rdar://63289339 for the 5.3 release. The fix I made on master, #31906, potentially changes a lot of other attributes and so has a substantial amount of extra risk. The risk for this PR is really just the inherent risk of guaranteeing traps during auths.