[clang] [llvm] [HLSL][DXIL] Implementation of round intrinsic (PR #83570)

[S. Bharadwaj Yadavalli via cfe-commits]

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@@ -220,6 +220,9 @@ def Sin  : DXILOpMapping<13, unary, int_sin,
                          "Returns sine(theta) for theta in radians.">;
 def UMax : DXILOpMapping<39, binary, int_umax,
                          "Unsigned integer maximum. UMax(a,b) = a > b ? a : b">;
+def Round : DXILOpMapping<26, unary, int_round,
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bharadwajy wrote:

Please consider adding this before the `def UMax` to maintain a sorted order of opcode.

https://github.com/llvm/llvm-project/pull/83570