[Autobackout][FuncReg]Revert of change: 5796d4f

Don't do mad if thre are more than 1 immediate source

Change-Id: Id2c31b1e1dece96790384fd050376de00083aabc

Author: fangliu2020

IGC/Compiler/CISACodeGen/PatternMatchPass.cpp

@@ -2016,20 +2016,6 @@ namespace IGC
             }
         }
 
-        if (found)
-        {
-            uint8_t numConstant = 0;
-            for (int i = 0; i < 3; i++)
-            {
-                if (isa<Constant>(sources[i]))
-                    numConstant++;
-
-                // Only one immediate is supported
-                if (numConstant > 1)
-                    return false;
-            }
-        }
-
         // Check integer mad profitability.
         if (found && !isFpMad(I))
         {