[clang] [clang-tools-extra] [analyzer] Remove alpha.core.IdenticalExpr Checker (PR #114715)

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vabridgers wrote:

Thanks @5chmidti for the constructive comments. I believe those have been addressed. I'll follow up after this PR is approved and merged to split the LIT appropriately. Thanks for understanding this approach, it was the only one I could think of where the reviewers could transparently observe all features were maintained from the older checker. I'll happily make any other suggested improvements if I've missed something. Best

https://github.com/llvm/llvm-project/pull/114715