[CI/Build][AMD][Quantization] Fix test_int8_kernel.py by updating int8_utils...

[CI/Build][AMD][Quantization] Fix test_int8_kernel.py by updating int8_utils to use hip.libdevice.round (#30151)
Signed-off-by: Randall Smith <ransmith@amd.com>
Co-authored-by: Randall Smith <ransmith@amd.com>

vllm/model_executor/layers/quantization/utils/int8_utils.py

@@ -83,26 +83,11 @@ def block_dequant(
 
 
 if current_platform.is_rocm():
-    from triton.language import core
-
-    # NOTE: This can be removed when hip.libdevice.round() is available.
-    @core.extern
-    def round_f32(arg0, _builder=None):
-        return core.extern_elementwise(
-            "",
-            "",
-            [arg0],
-            {
-                (core.dtype("fp32"),): ("llvm.round", core.dtype("fp32")),
-                (core.dtype("fp64"),): ("llvm.round", core.dtype("fp64")),
-            },
-            is_pure=True,
-            _builder=_builder,
-        )
 
     @triton.jit
     def round_int8(x):
-        return round_f32(x).to(tl.int8)
+        return tl.extra.hip.libdevice.round(x).to(tl.int8)
+
 else:
 
     @triton.jit