Prevent aliasing between private memory and stateful accesses

Change-Id: I3bdf449e96861aa9f3eea2e92c596bd554d91baa

Author: traoux1

IGC/Compiler/Optimizer/OpenCLPasses/AddressSpaceAliasAnalysis/AddressSpaceAliasAnalysis.cpp

@@ -83,6 +83,13 @@ class AddressSpaceAAResult : public AAResultBase<AddressSpaceAAResult> {
         return NoAlias;
     }
 
+    // Private memory doesn't alias any stateful memory
+    if((AS1 == ADDRESS_SPACE_PRIVATE && AS2 > ADDRESS_SPACE_NUM_ADDRESSES) ||
+        (AS1 > ADDRESS_SPACE_NUM_ADDRESSES && AS2 == ADDRESS_SPACE_PRIVATE))
+    {
+        return NoAlias;
+    }
+
 
     /// For some client APIs (e.g. vulkan) compiler is free to assume that
     /// resources bound to two different bindings points never alias unless a