[llvm] [AMDGPU] Extend llvm.amdgcn.update.dpp intrinsic to support f64 (PR #91190)

[Vikram Hegde via llvm-commits]

vikramRH wrote:

> Is there any reason the sdag and globalisel tests can't be combined into a single file with two RUN lines?

Not really, I just extended the existing setup. If it makes more sense , I could combine and autogenerate run lines in the current sdag testfile.

https://github.com/llvm/llvm-project/pull/91190