[clang] [X86][vectorcall] Do not consume register for indirect return value (PR #97939)

[Eli Friedman via cfe-commits]

https://github.com/efriedma-quic commented:

It looks like MSVC also applies this rule to fastcall.

Maybe put a boolean in the "state" to try to group together the code for specific conventions, instead of directly checking the CC.

https://github.com/llvm/llvm-project/pull/97939