Enable Integer MAD and fix profitability function for

pattern matching MAD

Enable Integer MAD by default, and fix profitability function for
matching MAD

Author: bowenxue-intel

IGC/Compiler/CISACodeGen/DriverInfo.hpp

@@ -294,7 +294,7 @@ namespace IGC
         virtual bool SupportsDispatchGPGPUWalkerAlongYFirst() const { return true; }
 
         /// Check if integer mad is enabled
-        virtual bool EnableIntegerMad() const { return false; }
+        virtual bool EnableIntegerMad() const { return true; }
 
         /// Respect per instruction 'contract' Fast-Math flag
         virtual bool RespectPerInstructionContractFlag() const { return false; }