[clang] [flang] [flang] Preserve fixed form in fc1 -x value (PR #117563)

[Andrzej Warzyński via cfe-commits]

banach-space wrote:

Adding new types to [Types.def](https://github.com/llvm/llvm-project/pull/117563/files#diff-b2abf750cadedc6109158e6f82b66abfaabd7c7c86c650d2a5163dc3e5fc44a7) is a fairly huge design update.  I'm not saying this is approach is incorrect, but it definitely deserves a bit of discussion. Perhaps under a GitHub issue? I don't really mind.

Could you quickly summarise what's not working and why adding new types to Types.def solves that? Is that the only solution?

https://github.com/llvm/llvm-project/pull/117563