Revert "Adding GDB PrettyPrinter for mlir::Identifier." This reverts commit 9e9e6e698d8ef5dc5b7576058f2022aab2534a52. This commit is causing builds that include the 'debuginfo-tests' project to fail. Apple has a public bot which shows the failure: http://green.lab.llvm.org/green/view/LLDB/job/lldb-cmake/23667/console GitOrigin-RevId: 485e6db8729383345da9796218d99843449057ac