Remove obsolete code from GASResolving pass

Remove unused code from GASResolving pass

Author: krzysiek358

IGC/Compiler/Optimizer/OpenCLPasses/GenericAddressResolution/GASResolving.cpp

@@ -147,8 +147,6 @@ bool GASResolving::resolveMemoryFromHost(Function& F) const {
 
     // collect load candidates and in parallel check for unsafe instructions
     // visitor may be a more beautiful way to do this
-    bool HasASCast = false; // if there exists addrspace cast from non global/generic space
-    bool HasPtoi = false; // if there exists ptrtoint with global/generic space
     for (BasicBlock& B : F) {
         for (Instruction& I : B) {
             if (auto LI = dyn_cast<LoadInst>(&I)) {
@@ -173,22 +171,8 @@ bool GASResolving::resolveMemoryFromHost(Function& F) const {
                 return false;
             }
             else if (auto PI = dyn_cast<PtrToIntInst>(&I)) {
-                // if we have a ptrtoint we need to check data flow which we don't want to
-                if (PI->getPointerAddressSpace() != ADDRESS_SPACE_GLOBAL &&
-                    PI->getPointerAddressSpace() != ADDRESS_SPACE_GENERIC)
-                    return false;
-                else {
-                    HasPtoi = true;
-                }
-
                 return false;
             }
-            else if (auto AI = dyn_cast<AddrSpaceCastInst>(&I)) {
-                if (AI->getSrcAddressSpace() != ADDRESS_SPACE_GLOBAL &&
-                    AI->getSrcAddressSpace() != ADDRESS_SPACE_GENERIC) {
-                    HasASCast = true;
-                }
-            }
             else if (auto SI = dyn_cast<StoreInst>(&I)) {
                 Value* V = SI->getValueOperand();
                 if (isa<PointerType>(V->getType())) {
@@ -202,8 +186,6 @@ bool GASResolving::resolveMemoryFromHost(Function& F) const {
             }
         }
     }
-    if (HasASCast && HasPtoi)
-        return false;
 
     if (Loads.empty())
         return false;