Vlad Serebrennikov 27d37ee4d0 [clang][NFC] Clean up Sema headers ...

When various `Sema*.h` and `Sema*.cpp` files were created, cleanup of
`Sema.h` includes and forward declarations was left for the later.
Now's the time. This commit touches `Sema.h` and Sema components:
1. Unused includes are removed.
2. Unused forward declarations are removed.
3. Missing includes are added (those files are largely IWYU-clean now).
4. Includes were converted into forward declarations where possible.

As this commit focuses on headers, all changes to `.cpp` files were
minimal, and were aiming at keeping everything buildable.

2024-08-17 14:57:59 +03:00

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