[clang] [Clang][RISCV] Introduce tuple types for RVV bfloat16 (PR #72216)

[antoine moynault via cfe-commits]

antmox wrote:

This also broke several aarch64 bots:
https://lab.llvm.org/buildbot/#/builders/245/builds/16676
https://lab.llvm.org/buildbot/#/builders/188/builds/37969
https://lab.llvm.org/buildbot/#/builders/198/builds/6244
https://lab.llvm.org/buildbot/#/builders/176/builds/6987
https://lab.llvm.org/buildbot/#/builders/186/builds/13185
https://lab.llvm.org/buildbot/#/builders/183/builds/17354


https://github.com/llvm/llvm-project/pull/72216