Fix minor compile warnings

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/BranchingExpressionGenerator.kt

@@ -106,7 +106,6 @@ class BranchingExpressionGenerator(statementGenerator: StatementGenerator) : Sta
 
         // TODO relies on ControlFlowInformationProvider, get rid of it
         val isUsedAsExpression = get(BindingContext.USED_AS_EXPRESSION, expression) ?: false
-        val isExhaustive = expression.isExhaustiveWhen()
 
         val resultType = when {
             isUsedAsExpression -> inferredType.toIrType()

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/CallGenerator.kt

@@ -172,7 +172,7 @@ class CallGenerator(statementGenerator: StatementGenerator) : StatementGenerator
         val irType = descriptor.type.toIrType()
 
         return if (getMethodDescriptor == null) {
-            call.callReceiver.call { dispatchReceiverValue, extensionReceiverValue ->
+            call.callReceiver.call { dispatchReceiverValue, _ ->
                 val fieldSymbol = context.symbolTable.referenceField(descriptor.original)
                 IrGetFieldImpl(
                     startOffset, endOffset,

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/ReflectionReferencesGenerator.kt

@@ -156,6 +156,7 @@ class ReflectionReferencesGenerator(statementGenerator: StatementGenerator) : St
     private fun getFieldForPropertyReference(originalProperty: PropertyDescriptor) =
         // NB this is a hack, we really don't know if an arbitrary property has a backing field or not
         when {
+            @Suppress("DEPRECATION")
             originalProperty.isDelegated -> null
             originalProperty.getter != null -> null
             else -> context.symbolTable.referenceField(originalProperty)