TSL: Fix Math/Operators fail generate cache with same node

[sunag]

Description

It was not automatically generating cache if the same node was using more than one argument from the same node, e.g:

const a = vector.normalize();

// The result of normalize is now stored in a variable to avoid redundancy due to it being used more than once.
// Without needs to use 'a.toVar()' for this

const b = a.mul( a );