[clang] [NFC] Optimize file kind determination (PR #139492)

Sun May 11 21:14:19 PDT 2025

https://github.com/spavloff created https://github.com/llvm/llvm-project/pull/139492

There are checks in clang codebase that determine the type of source file, associated with a given location - specifically, if it is an ordonary file or comes from sources like command-line options or a built-in definitions. These checks often rely on calls to `getPresumedLoc`, which is relatively expensive.  In certain cases, these checks are combined, leading to repeated calculations of the costly function negatively affecting compile time.

This change tries to optimize such checks. It must fix compile time regression introduced in https://github.com/llvm/llvm-project/pull/137306/.

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