Solved bug found by Teme about asserts.
Previously assert expression containing -> would lead to unnormalized ite. Now each expression within the assert is normalized and may bind new node equations.
This could be later optimized but is working now.
git-svn-id: https://cavale.enseeiht.fr/svn/lustrec/lustre_compiler/trunk@406 041b043f-8d7c-46b2-b46e-ef0dd855326e