This change removes the alpha.core.IdenticalExpr static analysis checker since it's checks are present in the clang-tidy checks misc-redundant-expression and bugprone-branch-clone. This check was implemented as a static analysis check using AST matching, and since alpha and duplicated in 2 clang-tidy checks may be removed. Co-authored-by: Vince Bridgers <vince.a.bridgers@ericsson.com>