[llvm-dev] Functions have two types, one can be mutated but not the other

[Andy Ayers via llvm-dev]

Function has its own FunctionType* member as well as a Type* member that it inherits from GlobalValue. The latter can be mutated but not the former, leading to potential strange inconsistencies.

While I realize using mutateType is probably going to trigger a bunch of "you're doing it wrong" replies, it seems like mutateType, as a necessary evil, should be virtual and do the right wrong thing for Functions too.

Thoughts?
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