Michael Gottesman 456dfc9708 [sil-optimizer] Add LLVM_ATTRIBUTE_UNUSED to InstModCallback::on* methods. ...

InstModCallback is a value type and as such the original callback struct is not
being modified. Instead, a new InstModCallback struct is returned that is the
old callback + assignment of the passed in callback to the appropriate
field. Thus it makes sense to put this attribute on these methods so that we get
a warning if one does not use the new returned callback (otherwise, why would
one call this method?!). More likely a bug.

2021-04-30 14:34:02 -07:00

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