[PATCH] D136919: [X86][RFC] Change mangle name of __bf16 from u6__bf16 to DF16b

[John McCall via Phabricator via cfe-commits]

rjmccall added a comment.

We talked about this on the Itanium list, and as currently specified, it is absolutely not correct for `__bf16` to have the same mangling as `std::bfloat16_t`, because these types do not have the same semantics.  If GCC did that, it is a bug.

That discussion was here: https://github.com/itanium-cxx-abi/cxx-abi/pull/147


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https://reviews.llvm.org/D136919