Mark some expressions after processing their components

when it's semantically correct

Expressions: calls, 'for' loops, elvis operators
It's significant for reporting 'unreachable code' correctly

compiler/testData/cfg/arrays/arraySetPlusAssign.instructions

@@ -9,12 +9,13 @@ L0:
     magic(a: Array<Int>) -> <v0>
     w(a|<v0>)
   2 mark({ a[0] += 1 })
-    mark(a[0] += 1)
     mark(a[0])
     r(a) -> <v1>
     r(0) -> <v2>
+    mark(a[0])
     call(a[0], get|<v1>, <v2>) -> <v3>
     r(1) -> <v4>
+    mark(a[0] += 1)
     call(+=, plus|<v3>, <v4>) -> <v5>
     r(a) -> <v6>
     r(0) -> <v7>