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/conventions/incrementAtTheEnd.instructions

@@ -10,8 +10,8 @@ L0:
     v(var i = 1)
     r(1) -> <v0>
     w(i|<v0>)
-    mark(i++)
     r(i) -> <v1>
+    mark(i++)
     call(++, inc|<v1>) -> <v2>
     w(i|<v2>)
 L1: