Fix address space values for NVPTX

Author: anominos

clang/lib/CIR/Dialect/Transforms/TargetLowering/Targets/NVPTX.cpp

@@ -52,9 +52,9 @@ class NVPTXTargetLoweringInfo : public TargetLoweringInfo {
     case Kind::offload_global:
       return 1;
     case Kind::offload_constant:
-      return 2;
-    case Kind::offload_generic:
       return 4;
+    case Kind::offload_generic:
+      return 0;
     default:
       cir_cconv_unreachable("Unknown CIR address space for this target");
     }