[clang] [flang] [lld] [llvm] [Flang][NFC] Move runtime library files to flang-rt. (PR #110298)

[Michael Kruse via llvm-commits]

Meinersbur wrote:

@clementval You agreed to a new folder structure in https://discourse.llvm.org/t/rfc-names-for-flang-rt-libraries/84321/4. Could you please review this PR again?

The "Check code formatting" stage does not pass by design. For moved/renamed files it requires a complete reformatting, I only clang-formatted the #includes, thus will complain about anything that it not formatted before this PR.

https://github.com/llvm/llvm-project/pull/110298