[llvm] [llvm][NFC] `APFloat`: Add missing semantics to enum (PR #117291)

[Kazu Hirata via llvm-commits]

kazutakahirata wrote:

@matthias-springer I've checked in https://github.com/llvm/llvm-project/commit/32b821cab3064ae9a77a0f1d9916a286c7543735 to fix a warning for now.  Should `S_PPCDoubleDoubleLegacy` be treated the same way as `S_PPCDoubleDouble`?


https://github.com/llvm/llvm-project/pull/117291