[clang] [lldb] Serialize `#pragma redefine_extname` into precompiled headers. (PR #186755)

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divVerent wrote:

@ChuanqiXu9 This is probably in your area (serialization & modules). The logic in this patch is similar to what was last significantly changed in 1c4bfe5ac69fe13c37a7858b633c209fc47711d8, which was in 2011, and initially introduced in ee1afa30827e0805394cecc092beb083d1169283, which was in 2010.

https://github.com/llvm/llvm-project/pull/186755