Control-Flow Analysis: Reuse pseudo-value information for unused expression analysis

compiler/testData/diagnostics/tests/controlStructures/kt1075.kt

@@ -5,7 +5,7 @@ package kt1075
 fun foo(b: String) {
     if (<!TYPE_MISMATCH!>b<!> in 1..10) {} //type mismatch
     when (b) {
-        <!TYPE_MISMATCH_IN_RANGE!>in<!> 1..10 -> 1 //no type mismatch, but it should be here
-        else -> 2
+        <!TYPE_MISMATCH_IN_RANGE!>in<!> 1..10 -> <!UNUSED_EXPRESSION!>1<!> //no type mismatch, but it should be here
+        else -> <!UNUSED_EXPRESSION!>2<!>
     }
-}
+}