Fix image coordinates widening

PreprocessSPVIR is a pass to introduce some modifications to builtins
produced by Khronos SPIRV-LLVM-Translator to make them consumable by
IGC Scalar BiFModule.

This change fixes image coordinates widening logic for the case when
coordiates argument produced by Khronos Translator has already a desired
width.

Author: aratajew

IGC/AdaptorOCL/PreprocessSPVIR.cpp

@@ -94,6 +94,11 @@ Value* PreprocessSPVIR::getWidenImageCoordsArg(Value* Coords)
 
         newCoords = m_Builder->CreateShuffleVector(Coords, UndefValue::get(coordsType), ConstantVector::get(shuffleIdx));
     }
+    else
+    {
+        // coordinate argument has already a desired width
+        newCoords = Coords;
+    }
     return newCoords;
 }