[flang-commits] [flang] [Flang][Parser] Refactor parse tree enumerations into common header (PR #65339)

[Peter Klausler via flang-commits]

klausler wrote:

Many of these types were nested within struct/class definitions, and moving them out of those struct/class definitions and into another file is just doing to make them harder to find.  Do not do this.

This restructuring only makes sense for enumerations that are needed both in parse tree definitions and in the symbol table.

https://github.com/llvm/llvm-project/pull/65339