[clang] Emit debug info with original source location for tokens from macros … (PR #163190)

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SergejSalnikov wrote:

> getRefinedSpellingLoc - I'm not sure "refined" carries enough information (is it a reference to some other existing use of the term?) - but I don't have any great suggestions for a name. Perhaps "immediate" or "local" spelling location?

I've just found out that there is already getFileLoc method, which was not very optimized. So I've fixed it and use it instead of introducing a new one.

https://github.com/llvm/llvm-project/pull/163190