for does not loop as expected with variable.

[volzhs]

Godot version:
3.2.2-rc 909e303

OS/device including version:
Linux mint 19.3

Issue description:
for does not loop as expected with variable.

Steps to reproduce:

	var index = 0
	printt(range(index + 1, 3))  # prints [1,2]
	for i in range(index + 1, 3):
		printt("i =", i)  # prints only 'i = 0' and loop ended

Minimal reproduction project:

[volzhs]

it works as expected with da4eb71

[volzhs]

#36859 seems related.
cc @ThakeeNathees @vnen