[clang] [clang-tools-extra] [clang] Extend SourceLocation to 64 bits. (PR #147292)

[Chuanqi Xu via cfe-commits]

https://github.com/ChuanqiXu9 commented:

Have you tested this with google's internal modules test? If yes, then LG.

https://github.com/llvm/llvm-project/pull/147292