fix #45494, error in ssa conversion with complex type decl

We were missing a call to `renumber-assigned-ssavalues` in the case where the
declared type is used to assert the type of a value taken from a closure box.

src/julia-syntax.scm

@@ -3977,7 +3977,10 @@ f(x) = yt(x)
                  (val (if (equal? typ '(core Any))
                           val
                           `(call (core typeassert) ,val
-                                 ,(cl-convert typ fname lam namemap defined toplevel interp opaq parsed-method-stack globals locals)))))
+                                 ,(let ((convt (cl-convert typ fname lam namemap defined toplevel interp opaq parsed-method-stack globals locals)))
+                                    (if (or (symbol-like? convt) (quoted? convt))
+                                        convt
+                                        (renumber-assigned-ssavalues convt)))))))
             `(block
                ,@(if (eq? box access) '() `((= ,access ,box)))
                ,undefcheck

test/syntax.jl

@@ -3975,3 +3975,13 @@ module UsingFailedExplicit
     using .A: x as x
     @test x === 1
 end
+
+# issue #45494
+begin
+  local b::Tuple{<:Any} = (0,)
+  function f45494()
+    b = b
+    b
+  end
+end
+@test f45494() === (0,)