Classified usages in "is" of when entry correctly.

#KT-7047 fixed

idea/idea-analysis/src/org/jetbrains/kotlin/idea/findUsages/UsageTypeUtils.kt

@@ -103,7 +103,8 @@ public object UsageTypeUtils {
                 refExpr.getParentOfTypeAndBranch<JetParameter>(){ getTypeReference() } != null ->
                     VALUE_PARAMETER_TYPE
 
-                refExpr.getParentOfTypeAndBranch<JetIsExpression>(){ getTypeReference() } != null ->
+                refExpr.getParentOfTypeAndBranch<JetIsExpression>(){ getTypeReference() } != null
+                || refExpr.getParentOfTypeAndBranch<JetWhenConditionIsPattern>(){ getTypeReference() } != null ->
                     IS
 
                 with(refExpr.getParentOfTypeAndBranch<JetBinaryExpressionWithTypeRHS>(){ getRight() }) {

idea/testData/findUsages/kotlin/findClassUsages/kotlinClassAllUsages.1.kt

@@ -38,5 +38,8 @@ fun Client.hasNextServer(): Boolean {
 }
 
 fun Any.asServer(): Server? {
+    when (this) {
+        is Server -> println("Server!")
+    }
     return if (this is Server) this as Server else null
 }

idea/testData/findUsages/kotlin/findClassUsages/kotlinClassAllUsages.results.txt

@@ -11,6 +11,7 @@ Super type qualifier (19: 15) super<Server>.work()
 Supertype (23: 23) companion object: Server() {
 Supertype (28: 22) object ClientObject: Server() {
 Supertype (5: 43) class Client(name: String = Server.NAME): Server() {
-Target type of 'is' operation (41: 24) return if (this is Server) this as Server else null
-Usage in cast target type (41: 40) return if (this is Server) this as Server else null
+Target type of 'is' operation (42: 12) is Server -> println("Server!")
+Target type of 'is' operation (44: 24) return if (this is Server) this as Server else null
+Usage in cast target type (44: 40) return if (this is Server) this as Server else null
 Usage in import (3: 15) import server.Server