[CIR] Fix assertion order in 'Address' (#157477)

We are checking the 'type' of 'pointer' before we are checking whether
it is null or not! This is clearly incorrect, so this patch reorders the
asserts.

Author: erichkeane

clang/lib/CIR/CodeGen/Address.h

@@ -44,13 +44,13 @@ class Address {
           clang::CharUnits alignment)
       : pointerAndKnownNonNull(pointer, false), elementType(elementType),
         alignment(alignment) {
-    assert(mlir::isa<cir::PointerType>(pointer.getType()) &&
-           "Expected cir.ptr type");
-
     assert(pointer && "Pointer cannot be null");
     assert(elementType && "Element type cannot be null");
     assert(!alignment.isZero() && "Alignment cannot be zero");
 
+    assert(mlir::isa<cir::PointerType>(pointer.getType()) &&
+           "Expected cir.ptr type");
+
     assert(mlir::cast<cir::PointerType>(pointer.getType()).getPointee() ==
            elementType);
   }