John McCall 4f54c75dc8 Use Clang's logic for adding the default IR attributes to a function. ...

A lot of attributes are essentially default target configuration, and we should only differ when there's a good reason to.

For the attributes we were already setting:
- the ptrauth and target CPU/feature attributes are taken care of by Clang
- I've updated the optsize/minsize attributes to the apparent intent
- I've left the frame-pointer override in place for now

Fixes rdar://63289339, which was caused by Swift's ptrauth IR attributes getting out of sync with Clang's.

2020-05-21 02:24:20 -04:00

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