[clang] [Clang][NFC] Add special handling of mfloat8 in initializer lists (PR #125097)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

Please don't mark this "NFC"; I'd consider this a functional change, even if it doesn't have any obvious effect on non-asserts builds.

https://github.com/llvm/llvm-project/pull/125097