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<!>
     }
-}
+}

compiler/testData/diagnostics/tests/controlStructures/kt786.kt

@@ -15,7 +15,7 @@ fun foo() : Int {
 fun fff(): Int {
     var d = 3
     when(d) {
-        4 -> 21
+        4 -> <!UNUSED_EXPRESSION!>21<!>
         return 2 -> <!UNREACHABLE_CODE!>return 47<!>
         <!UNREACHABLE_CODE!>bar() -> 45<!>
         <!UNREACHABLE_CODE!>444 -> true<!>

compiler/testData/diagnostics/tests/controlStructures/when.kt234.kt973.kt

@@ -21,7 +21,7 @@ fun test1(t : Pair<Int, Int>) : Int {
 }
 
 //more tests
-fun t1(x: Int) = when(x) {
+fun t1(x: Int) = when(<!UNUSED_EXPRESSION!>x<!>) {
     else -> 1
 }