Disable denorm retain for math instructions for OCL

Denorm retain for math instructions has to be
disabled for OCL shaders because of performance regression.

Author: JaroszPiotr

IGC/Compiler/CISACodeGen/CISABuilder.cpp

@@ -4326,10 +4326,11 @@ namespace IGC
 
         CodeGenContext* pCtx = m_program->GetContext();
         bool needsDenormRetainForMathInstructions =
-            (pCtx->m_floatDenormMode16 == FLOAT_DENORM_FLUSH_TO_ZERO) ||
-            (pCtx->m_floatDenormMode32 == FLOAT_DENORM_FLUSH_TO_ZERO) ||
-            (pCtx->m_floatDenormMode64 == FLOAT_DENORM_FLUSH_TO_ZERO) ||
-            (pCtx->m_floatDenormModeBFTF == FLOAT_DENORM_FLUSH_TO_ZERO);
+            (context->type != ShaderType::OPENCL_SHADER) &&
+            ((pCtx->m_floatDenormMode16 == FLOAT_DENORM_FLUSH_TO_ZERO) ||
+             (pCtx->m_floatDenormMode32 == FLOAT_DENORM_FLUSH_TO_ZERO) ||
+             (pCtx->m_floatDenormMode64 == FLOAT_DENORM_FLUSH_TO_ZERO) ||
+             (pCtx->m_floatDenormModeBFTF == FLOAT_DENORM_FLUSH_TO_ZERO));
 
         if (m_program->m_Platform->hasCorrectlyRoundedMacros() && needsDenormRetainForMathInstructions)
         {