[Native] Move hasNonConstInitializer from IrUtils2

This function could be useful for other backends.

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/IrUtils.kt

@@ -171,6 +171,9 @@ fun IrMemberAccessExpression<*>.addArguments(args: Map<ParameterDescriptor, IrEx
     }
 }
 
+val IrField.hasNonConstInitializer: Boolean
+    get() = initializer?.expression.let { it != null && it !is IrConst<*> && it !is IrConstantValue }
+
 fun IrExpression.isNullConst() = this is IrConst<*> && this.kind == IrConstKind.Null
 
 fun IrExpression.isTrueConst() = this is IrConst<*> && this.kind == IrConstKind.Boolean && this.value == true