Only duplicate and make_zero! if enzyme func is non-constant

Author: ChrisRackauckas

Diff for: src/derivative_wrappers.jl

@@ -707,11 +707,16 @@ function _vecjacobian!(dλ, y, λ, p, t, S::TS, isautojacvec::EnzymeVJP, dgrad,
 
     isautojacvec = get_jacvec(sensealg)
 
-    Enzyme.make_zero!(_tmp6)
+    if Core.Compiler.isconstType(_tmp6)
+        Enzyme.make_zero!(_tmp6)
+        _f = Enzyme.Duplicated(S.diffcache.pf, _tmp6)
+    else
+        _f = S.diffcache.pf
+    end
 
     if inplace_sensitivity(S)
         if W === nothing
-            Enzyme.autodiff(Enzyme.Reverse, Enzyme.Duplicated(S.diffcache.pf, _tmp6),
+            Enzyme.autodiff(Enzyme.Reverse, _f,
                 Enzyme.Const, Enzyme.Duplicated(tmp3, tmp4),
                 Enzyme.Duplicated(ytmp, tmp1),
                 dup,