[llvm] [ADT] Skip destroying trivially destructible values in DenseMap (PR #106934)

[Kazu Hirata via llvm-commits]

kazutakahirata wrote:

> This looks fine in isolation, but I wonder if we do have a test that makes sure that non-trivial destructors get run?

Let me come up with some tests.  Thanks!

https://github.com/llvm/llvm-project/pull/106934