[clang] [lld] [llvm] Run ObjCContractPass in Default Codegen Pipeline (PR #92331)

[Nikita Popov via llvm-commits]

nikic wrote:

Reverted due to major compile-time regressions for unoptimized builds, see https://llvm-compile-time-tracker.com/compare.php?from=910292c3ac2ebe43cdbc90223c6c9702128316db&to=8cc8e5d6c6ac9bfc888f3449f7e424678deae8c2&stat=instructions:u.

https://github.com/llvm/llvm-project/pull/92331