[clang] [llvm] [CodeGen][LLVM] Make the `va_list` related intrinsics generic. (PR #85460)

[Jessica Clarke via cfe-commits]

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+// REQUIRES: spirv-registered-target
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jrtc27 wrote:

Does it actually? Normally -emit-llvm works regardless of the enabled backends

https://github.com/llvm/llvm-project/pull/85460