Add -Xno-use-ir to override useIR flag for custom-built compiler

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JVMCompilerArguments.kt

@@ -80,6 +80,9 @@ class K2JVMCompilerArguments : CommonCompilerArguments() {
     @Argument(value = "-Xuse-ir", description = "Use the IR backend")
     var useIR: Boolean by FreezableVar(false)
 
+    @Argument(value = "-Xno-use-ir", description = "Do not use the IR backend. Useful for a custom-built compiler where IR backend is enabled by default")
+    var noUseIR: Boolean by FreezableVar(false)
+
     @Argument(
         value = "-Xir-check-local-names",
         description = "Check that names of local classes and anonymous objects are the same in the IR backend as in the old backend"

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/jvmArguments.kt

@@ -143,7 +143,7 @@ fun CompilerConfiguration.configureAdvancedJvmOptions(arguments: K2JVMCompilerAr
 
     put(JVMConfigurationKeys.PARAMETERS_METADATA, arguments.javaParameters)
 
-    put(JVMConfigurationKeys.IR, arguments.useIR)
+    put(JVMConfigurationKeys.IR, arguments.useIR && !arguments.noUseIR)
     put(JVMConfigurationKeys.DISABLE_CALL_ASSERTIONS, arguments.noCallAssertions)
     put(JVMConfigurationKeys.DISABLE_RECEIVER_ASSERTIONS, arguments.noReceiverAssertions)
     put(JVMConfigurationKeys.DISABLE_PARAM_ASSERTIONS, arguments.noParamAssertions)