[clang] Revert "[ObjC][Preprocessor] Handle @import directive as a pp-directive" (PR #188806)

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yronglin wrote:

> @yronglin let us (lldb folks) know how we can help

The PR just add restrictions for `@import`.  I guess the test may break the restrictions , and need update.

> This is causing a number of lldb test failures, specifically tests that do @import ... expression evaluation. See https://green.lab.llvm.org/job/llvm.org/view/LLDB/job/as-lldb-cmake/

Could you please provide a link to the test log? I don't know how to find the correct test log in this webpage.

https://github.com/llvm/llvm-project/pull/188806