[cfe-commits] [patch][pr13142] Call the correct method when looking through casts to final classes.

[Rafael Espíndola]

Clang currently looks through casts to find out if the class it is
calling a method of is final, but then forgets to look again when
actually producing the direct call.

The attached patch fixes it, but I had to code a method for finding
the corresponding method in a derived class. I assume something like
this already exists somewhere (for building vtables for example), but
I could not find it.

Cheers,
Rafael
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