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2025-02-06[Flang] Move non-common headers to FortranSupport (#124416)Michael Kruse
Move non-common files from FortranCommon to FortranSupport (analogous to LLVMSupport) such that * declarations and definitions that are only used by the Flang compiler, but not by the runtime, are moved to FortranSupport * declarations and definitions that are used by both ("common"), the compiler and the runtime, remain in FortranCommon * generic STL-like/ADT/utility classes and algorithms remain in FortranCommon This allows a for cleaner separation between compiler and runtime components, which are compiled differently. For instance, runtime sources must not use STL's `<optional>` which causes problems with CUDA support. Instead, the surrogate header `flang/Common/optional.h` must be used. This PR fixes this for `fast-int-sel.h`. Declarations in include/Runtime are also used by both, but are header-only. `ISO_Fortran_binding_wrapper.h`, a header used by compiler and runtime, is also moved into FortranCommon.