[llvm-dev] RFC: New function attribute "patchable-prologue"="<kind>"

[Reid Kleckner via llvm-dev]

I think most function redirection patching schemes are going to be mutually
incompatible, so I'm not sure it makes sense to make this attribute a
comma-separated list.

I think Eric's and Dean's use case may be better addressed by a separate
attribute. My recollection is that they want to add nop slides to the
prologue and epilogue that can be hotpatched to enable and disable
instrumentation at runtime.
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