[PATCH] D154658: Optimize emission of `dynamic_cast` to final classes.

[Richard Smith - zygoloid via Phabricator via cfe-commits]

rsmith added a comment.

In D154658#4516554 <https://reviews.llvm.org/D154658#4516554>, @rjmccall wrote:

> LGTM, except, should we have a way to turn this optimization off specifically?

Sure. I suppose even for an internal linkage vtable there could be a reason to want to turn this off (eg, if someone constructs a custom vtable at runtime). I've added `-fno-assume-unique-vtables` to disable the optimization.


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https://reviews.llvm.org/D154658