Remove unnecessary getThisAsReceiver function from Utils.kt file

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/interpreter/IrInterpreter.kt

@@ -366,7 +366,7 @@ class IrInterpreter(irModule: IrModuleFragment, private val declarationsMap: Map
             constructorCall.dispatchReceiver!!.interpret().check { return it }
             state.outerClass = Variable(constructorCall.symbol.owner.dispatchReceiverParameter!!.descriptor, stack.popReturnValue())
         }
-        valueArguments.add(Variable(constructorCall.getThisAsReceiver(), state)) //used to set up fields in body
+        valueArguments.add(Variable(irClass.thisReceiver!!.descriptor, state)) //used to set up fields in body
         return stack.newFrame(initPool = valueArguments + state.typeArguments) {
             val statements = constructorCall.getBody()!!.statements
             // enum entry use IrTypeOperatorCall with IMPLICIT_COERCION_TO_UNIT as delegation call, but we need the value

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/interpreter/Utils.kt

@@ -24,11 +24,6 @@ import org.jetbrains.kotlin.resolve.scopes.receivers.ExtensionReceiver
 import org.jetbrains.kotlin.resolve.scopes.receivers.ImplicitClassReceiver
 import org.jetbrains.kotlin.utils.addToStdlib.safeAs
 
-// main purpose is to get receiver from constructor call
-fun IrMemberAccessExpression.getThisAsReceiver(): DeclarationDescriptor {
-    return (this.symbol.descriptor.containingDeclaration as ClassDescriptor).thisAsReceiverParameter
-}
-
 fun IrFunction.getDispatchReceiver(): DeclarationDescriptor? {
     return (this.symbol.descriptor.containingDeclaration as? ClassDescriptor)?.thisAsReceiverParameter
 }
@@ -51,6 +46,7 @@ fun DeclarationDescriptor.equalTo(other: DeclarationDescriptor): Boolean {
 
 private fun WrappedReceiverParameterDescriptor.isEqualTo(other: DeclarationDescriptor): Boolean {
     return when (val container = this.containingDeclaration) {
+        is ClassDescriptor -> container == other.containingDeclaration
         is FunctionDescriptor -> container.dispatchReceiverParameter == other || container.extensionReceiverParameter == other
         else -> false
     }