Note that PointerUnion::dyn_cast has been soft deprecated in
PointerUnion.h:
// FIXME: Replace the uses of is(), get() and dyn_cast() with
// isa<T>, cast<T> and the llvm::dyn_cast<T>
Literal migration would result in dyn_cast_if_present (see the
definition of PointerUnion::dyn_cast), but this patch uses cast
because we expect the arguments to be of the requested types. Note
that all these cases have assert and/or dereferences just after cast,
implying that the return value from cast must be nonnull.
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Co-authored-by: Nikita Popov <github@npopov.com>
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