Revert Introduction of uniform private memory block

Revert "Introduction of uniform private memory block" commit

Author: gkluczek

IGC/Compiler/CISACodeGen/DriverInfo.hpp

@@ -380,8 +380,6 @@ namespace IGC
 
         // Informs if the UMD understands atomic pull tile walk for raytracing
         virtual bool supportsAtomicPullSWTileWalk() const { return false; }
-
-        virtual bool supportsUniformPrivateMemorySpace() const { return false; }
 protected:
     bool autoGRFSelection = false;
     };

IGC/Compiler/CISACodeGen/LowerGEPForPrivMem.cpp

@@ -559,11 +559,6 @@ bool SOALayoutChecker::checkStruct(StructType* StTy)
 // TODO: Consider a worklist-based implementation instead.
 bool SOALayoutChecker::checkUsers(Instruction& I)
 {
-    if (IGC_IS_FLAG_ENABLED(DisableSOAPromotion))
-    {
-        return false;
-    }
-
     parentLevelInst = &I;
     for (Value::user_iterator userIt = I.user_begin(), userE = I.user_end(); userIt != userE; ++userIt)
     {