Remove long-obsolete is_blocklisted_fn mechanism.
#267
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Whatever it was meant to protect against, seems to be long gone, so this was just wastefully pattern-matching all monomorphic function instances against e.g.
<_ as core::fmt::Debug>::fmt.Ran into the zombie1 it introduces when declaring a "blocklisted" function, and I was going to move that around so it at least always generates an
OpFunction, but nothing broke when removing the check entirely.1 (
OpUndefof typeOpTypeFunctionis already pretty sketchy, but it's even worse when passed to instructions that expect the ID of anOpFunction, not just "some value of function type")