Enable vector8 load/store by default for PVC.

Enable vector8 load/store by default for PVC platform supporting this feature.

Author: lwesiers

IGC/Compiler/CISACodeGen/ShaderCodeGen.cpp

@@ -765,7 +765,8 @@ void AddLegalizationPasses(CodeGenContext& ctx, IGCPassManager& mpm, PSSignature
 
         bool AllowVector8LoadStore =
             IGC_IS_FLAG_ENABLED(EnableVector8LoadStore) ||
-            ((ctx.type == ShaderType::RAYTRACING_SHADER || ctx.hasSyncRTCalls()) && ctx.platform.supports8DWLSCMessage());
+            ((ctx.type == ShaderType::RAYTRACING_SHADER || ctx.hasSyncRTCalls()) && ctx.platform.supports8DWLSCMessage()) ||
+            ctx.platform.getPlatformInfo().eProductFamily == IGFX_PVC;
 
         mpm.add(createMemOptPass(AllowNegativeSymPtrsForLoad, AllowVector8LoadStore));