[clang] [CLANG][AArch64] Add the modal 8 bit floating-point scalar type (PR #97277)

[David Spickett via cfe-commits]

DavidSpickett wrote:

FYI Arm 32 bit is failing on a different test than most of these - https://lab.llvm.org/buildbot/#/builders/154/builds/6442

https://github.com/llvm/llvm-project/pull/97277