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Fortran.h and target.h are defining symbols where some are used by both, the Fortran runtime (Flang-RT) and Fortran compiler (Flang), and others are used by Flang only. With the upcoming refactoring of the Fortran runtime into its own subproject (#110217), move the declarations that are used by both into new headers to minimize the amount of code that will need to be shared by Flang-RT and Flang. Details: * `Fortran.h`: Flang-RT only uses some enum definitions out of this file, but not `AsFortran` which is defined in `Fortran.cpp`. Moving the enums into `Fortran-consts.h` allows keeping `Fortran.cpp` within Flang. * `target.h`: Contains some floating-point definitions that is used by the non-GTest unittests in `fp-testing.h`. Flang-RT also uses some non-GTest as well. Moving those definitions avoids the dependence on the entire FortranEvaluate library.
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