[clang] [NFC][Clang][AArch64]Refactor implementation of Neon vectors MFloat8… (PR #114804)

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CarolineConcatto wrote:

Hi @paulwalker-arm ,
I think I misunderstand what we had agreed in a previous patch.
I am not sure if I still understand.
I am assuming now that you would like to keep clang target independent(without any reference to MFloat8), and change NeonEmmiter to use the BuiltIns.
What we will have looks  a bit like a Frankenstein. 
My previous implementation made the Neon vectors all look the same. Let me know if that is the direction you had in mind.

https://github.com/llvm/llvm-project/pull/114804