GDScript: Improve evaluation of constant expressions with arrays/dictionaries

modules/gdscript/tests/scripts/runtime/features/setter_chain_shared_types_2.gd

@@ -0,0 +1,31 @@
+var a: Array = [1]:
+	set(v):
+		prints("set a", v)
+		a = v
+	get:
+		prints("get a")
+		return a
+
+var b: PackedByteArray = [1]:
+	set(v):
+		prints("set b", v)
+		b = v
+	get:
+		prints("get b")
+		return b
+
+var c: PackedVector2Array = [Vector2.ONE]:
+	set(v):
+		prints("set c", v)
+		c = v
+	get:
+		prints("get c")
+		return c
+
+func test():
+	a[0] = 2
+	print(a)
+	b[0] = 2
+	print(b)
+	c[0].x = 2
+	print(c)

modules/gdscript/tests/scripts/runtime/features/setter_chain_shared_types_2.out

@@ -0,0 +1,10 @@
+GDTEST_OK
+get a
+get a
+[2]
+get b
+get b
+[2]
+get c
+get c
+[(2.0, 1.0)]