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/declarations/local/ObjectExpression.instructions

@@ -70,8 +70,8 @@ L0:
     r(object : A by b {}) -> <v2>
     w(o|<v2>)
     mark(o.foo())
-    mark(foo())
     r(o) -> <v3>
+    mark(foo())
     call(foo, foo|<v3>) -> <v4>
     ret(*|<v4>) L1
 L1:

compiler/testData/cfg/declarations/properties/backingFieldQualifiedWithThis.instructions

@@ -19,12 +19,12 @@ fun foo() = "foo" + this.$bar
 ---------------------
 L0:
   1 <START>
-    mark("foo" + this.$bar)
     mark("foo")
     r("foo") -> <v0>
     mark(this.$bar)
     r(this) -> <v1>
     r($bar|<v1>) -> <v2>
+    mark("foo" + this.$bar)
     call(+, plus|<v0>, <v2>) -> <v3>
 L1:
     <END>                               NEXT:[<SINK>]