Michael Gottesman 96097b0879 [opt-remark] Add @_semantics("optremark{.$SIL_PASS_NAME}") that force opt remarks on functions. ...

More specifically, if one wants to force emit /all/ opt-remarks on a function, mark it with:

```
@_semantics("optremark")
```

If one wants to emit opt-remarks only for a specific SIL pass (like lets say
sil-opt-remark-gen), one can write:

```
@_semantics("optremark.sil-opt-remark-gen")
```

I made the pattern matching strict so if you just put in a '.' or add additional
suffixes, it will not pattern match. I think that this is sufficient for a
prototyping tool.

This is useful if one wants to play around with opt-remarks when optimizing code
in Xcode or any IDE that can use serialized diagnostics.

2020-07-26 14:55:02 -07:00

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