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/expressions/nothingExpr.instructions

@@ -38,16 +38,16 @@ L0:
   1 <START>
   2 mark({ null!!.doSomething() bar().doSomething })
     mark(null!!.doSomething())
-    mark(doSomething())
-    mark(null!!)
     r(null) -> <v0>
     magic(null!!|<v0>) -> <v1>
     jmp(error)                                          NEXT:[<ERROR>]
+-   mark(doSomething())                                 PREV:[]
 -   call(doSomething, doSomething|<v1>) -> <v2>         PREV:[]
 -   mark(bar().doSomething)                             PREV:[]
 -   mark(bar())                                         PREV:[]
 -   call(bar, bar)                                      PREV:[]
 -   jmp(error)                                          NEXT:[<ERROR>]                                             PREV:[]
+-   mark(doSomething)                                   PREV:[]
 -   call(doSomething, doSomething) -> <v3>              PREV:[]
 L1:
   1 <END>                                               NEXT:[<SINK>]                                              PREV:[]