[CIR] Fix assertion order in 'Address'

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);
   }