[IR/Analysis] Defend against getting slightly wrong template arguments
passed into CRTP base classes.
This can sometimes happen and not cause an immediate failure when the
derived class is, itself, a template. You can end up essentially calling
methods on the wrong derived type but a type where many things will
appear to "work".
To fail fast and with a clear error message we can use a static_assert,
but we have to stash that static_assert inside a method body or nested
type that won't need to be completed while building the base class. I've
tried to pick a reasonably small number of places that seemed like
reliably places for this to be instantiated.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294272
91177308-0d34-0410-b5e6-
96231b3b80d8
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