reverted to using round even wiht emulation do to a mac os issue

Signed-off-by: Alexandre Eichenberger <alexe@us.ibm.com>

src/Dialect/Krnl/DialectBuilder.cpp

@@ -391,7 +391,9 @@ Value KrnlBuilder::roundEven(Value input) const {
   }
   // No need for custom support, use math roundEven. May want to evaluate
   // whether to use the mlir roundEven or our own emulation.
-  return create.math.roundEven(input);
+  // Note: MacOS CI has an issue with the roundEven instruction, thus continue
+  // to use emulation. May change in the future.
+  return create.math.roundEvenEmulation(input);
 }
 
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