Remove obsolete compiler flag -Xuse-ir

compiler/cli/cli-common/gen/org/jetbrains/kotlin/cli/common/arguments/K2JVMCompilerArgumentsCopyGenerated.kt

@@ -77,7 +77,6 @@ fun copyK2JVMCompilerArguments(from: K2JVMCompilerArguments, to: K2JVMCompilerAr
     to.suppressMissingBuiltinsError = from.suppressMissingBuiltinsError
     to.typeEnhancementImprovementsInStrictMode = from.typeEnhancementImprovementsInStrictMode
     to.useFastJarFileSystem = from.useFastJarFileSystem
-    to.useIR = from.useIR
     to.useJavac = from.useJavac
     to.useOldBackend = from.useOldBackend
     to.useOldClassFilesReading = from.useOldClassFilesReading

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

@@ -145,16 +145,6 @@ class K2JVMCompilerArguments : CommonCompilerArguments() {
 
     // Advanced options
 
-    @Argument(
-        value = "-Xuse-ir",
-        description = "Use the IR backend. This option has no effect unless the language version less than 1.5 is used"
-    )
-    var useIR = false
-        set(value) {
-            checkFrozen()
-            field = value
-        }
-
     @Argument(value = "-Xuse-old-backend", description = "Use the old JVM backend")
     var useOldBackend = false
         set(value) {

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

@@ -246,14 +246,8 @@ fun CompilerConfiguration.configureAdvancedJvmOptions(arguments: K2JVMCompilerAr
 
     put(JVMConfigurationKeys.PARAMETERS_METADATA, arguments.javaParameters)
 
-    // TODO: ignore previous configuration value when we do not need old backend in scripting by default
-    val useOldBackend = arguments.useOldBackend || (!arguments.useIR && get(JVMConfigurationKeys.IR) == false)
-    val useIR = arguments.useK2 || languageVersionSettings.languageVersion.usesK2 ||
-            if (languageVersionSettings.supportsFeature(LanguageFeature.JvmIrEnabledByDefault)) {
-                !useOldBackend
-            } else {
-                arguments.useIR && !useOldBackend
-            }
+    val useOldBackend = arguments.useOldBackend
+    val useIR = arguments.useK2 || languageVersionSettings.languageVersion.usesK2 || !useOldBackend
 
     messageCollector.report(LOGGING, "Using ${if (useIR) "JVM IR" else "old JVM"} backend")
 

compiler/fir/modularized-tests/tests/org/jetbrains/kotlin/fir/FE1FullPipelineModularizedTest.kt

@@ -16,7 +16,6 @@ internal val LANGUAGE_VERSION_K1: String = System.getProperty("fir.bench.languag
 class FE1FullPipelineModularizedTest : AbstractFullPipelineModularizedTest() {
     override fun configureArguments(args: K2JVMCompilerArguments, moduleData: ModuleData) {
         args.useK2 = false
-        args.useIR = true
         args.languageVersion = LANGUAGE_VERSION_K1
         // TODO: Remove when support for old modularized tests is removed
         if (moduleData.arguments == null) {

compiler/fir/modularized-tests/tests/org/jetbrains/kotlin/fir/FullPipelineModularizedTest.kt

@@ -18,7 +18,6 @@ internal val LANGUAGE_VERSION_K2: String = System.getProperty("fir.bench.languag
 class FullPipelineModularizedTest : AbstractFullPipelineModularizedTest() {
 
     override fun configureArguments(args: K2JVMCompilerArguments, moduleData: ModuleData) {
-        args.useIR = true
         args.languageVersion = LANGUAGE_VERSION_K2
 
         // TODO: Remove when support for old modularized tests is removed

compiler/incremental-compilation-impl/test/org/jetbrains/kotlin/incremental/AbstractIncrementalFirICLightTreeJvmCompilerRunnerTest.kt

@@ -14,7 +14,6 @@ abstract class AbstractIncrementalFirICLightTreeJvmCompilerRunnerTest : Abstract
         super.createCompilerArguments(destinationDir, testDir).apply {
             useK2 = true
             languageVersion = "2.0"
-            useIR = true
             useFirIC = true
             useFirLT = true
         }

compiler/incremental-compilation-impl/test/org/jetbrains/kotlin/incremental/AbstractIncrementalFirJvmCompilerRunnerTest.kt

@@ -25,7 +25,6 @@ abstract class AbstractIncrementalFirJvmCompilerRunnerTest : AbstractIncremental
         super.createCompilerArguments(destinationDir, testDir).apply {
             useK2 = true
             languageVersion = "2.0"
-            useIR = true
         }
 
     override val buildLogFinder: BuildLogFinder

compiler/incremental-compilation-impl/test/org/jetbrains/kotlin/incremental/AbstractIncrementalFirLightTreeJvmCompilerRunnerTest.kt

@@ -14,7 +14,6 @@ abstract class AbstractIncrementalFirLightTreeJvmCompilerRunnerTest : AbstractIn
         super.createCompilerArguments(destinationDir, testDir).apply {
             useK2 = true
             languageVersion = "2.0"
-            useIR = true
             useFirIC = false
             useFirLT = true
         }

compiler/testData/cli/jvm/extraHelp.out

@@ -141,7 +141,6 @@ where advanced options include:
                              including freshly supported reading of the type use annotations from class files.
                              See KT-45671 for more details
   -Xuse-fast-jar-file-system Use fast implementation on Jar FS. This may speed up compilation time, but currently it's an experimental mode
-  -Xuse-ir                   Use the IR backend. This option has no effect unless the language version less than 1.5 is used
   -Xuse-javac                Use javac for Java source and class files analysis
   -Xuse-old-backend          Use the old JVM backend
   -Xuse-old-class-files-reading Use old class files reading implementation. This may slow down the build and cause problems with Groovy interop.

compiler/tests-gen/org/jetbrains/kotlin/cli/CliTestGenerated.java

@@ -620,11 +620,6 @@ public class CliTestGenerated extends AbstractCliTest {
             runTest("compiler/testData/cli/jvm/inlineCycle.args");
         }
 
-        @TestMetadata("inlineCycle_ir.args")
-        public void testInlineCycle_ir() throws Exception {
-            runTest("compiler/testData/cli/jvm/inlineCycle_ir.args");
-        }
-
         @TestMetadata("instanceAccessBeforeSuperCall.args")
         public void testInstanceAccessBeforeSuperCall() throws Exception {
             runTest("compiler/testData/cli/jvm/instanceAccessBeforeSuperCall.args");
@@ -685,11 +680,6 @@ public class CliTestGenerated extends AbstractCliTest {
             runTest("compiler/testData/cli/jvm/invalidMetadataVersion.args");
         }
 
-        @TestMetadata("irSupported.args")
-        public void testIrSupported() throws Exception {
-            runTest("compiler/testData/cli/jvm/irSupported.args");
-        }
-
         @TestMetadata("javaSealedClass.args")
         public void testJavaSealedClass() throws Exception {
             runTest("compiler/testData/cli/jvm/javaSealedClass.args");
@@ -995,11 +985,6 @@ public class CliTestGenerated extends AbstractCliTest {
             runTest("compiler/testData/cli/jvm/nonLocalDisabled.args");
         }
 
-        @TestMetadata("nonLocalDisabled_ir.args")
-        public void testNonLocalDisabled_ir() throws Exception {
-            runTest("compiler/testData/cli/jvm/nonLocalDisabled_ir.args");
-        }
-
         @TestMetadata("nonexistentPathInModule.args")
         public void testNonexistentPathInModule() throws Exception {
             runTest("compiler/testData/cli/jvm/nonexistentPathInModule.args");