[cfe-commits] [PATCH] No longer crash with invalid deleted and defaulted functions

[Aaron Ballman]

This patch addresses PR14577; basically, if you have an invalid
function declaration (comes back null), then attempt to set it to
default or delete, we would crash because of dyn_cast usage.  The
patch switches the code over to dyn_cast_or_null and adds a few test
cases.

~Aaron
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