[clang] [llvm] [HLSL][SPIRV][DXIL] Implement `WaveActiveMax` intrinsic (PR #123428)

[Adam Yang via llvm-commits]

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@@ -19203,6 +19203,25 @@ static Intrinsic::ID getWaveActiveSumIntrinsic(llvm::Triple::ArchType Arch,
   }
 }
 
+// Return wave active sum that corresponds to the QT scalar type
+static Intrinsic::ID getWaveActiveMaxIntrinsic(llvm::Triple::ArchType Arch,
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adam-yang wrote:

I gave it a bit of try, it's kind of just shuffling things around and not really making things any easier to read. I think it okay as is.

https://github.com/llvm/llvm-project/pull/123428