KT-52217 Rename 'use-fir' to 'use-k2', update message

compiler/incremental-compilation-impl/src/org/jetbrains/kotlin/incremental/IncrementalJvmCompilerRunner.kt

@@ -88,7 +88,7 @@ fun makeIncrementally(
 
     withIC(args) {
         val compiler =
-            if (args.useFir && args.useFirIC && args.useFirLT /* TODO: move LT check into runner */ )
+            if (args.useK2 && args.useFirIC && args.useFirLT /* TODO: move LT check into runner */ )
                 IncrementalFirJvmCompilerRunner(
                     cachesDir, buildReporter, buildHistoryFile, emptyList(), EmptyModulesApiHistory, kotlinExtensions, ClasspathSnapshotDisabled
                 )
@@ -97,7 +97,7 @@ fun makeIncrementally(
                     cachesDir,
                     buildReporter,
                     // Use precise setting in case of non-Gradle build
-                    usePreciseJavaTracking = !args.useFir, // TODO: add fir-based java classes tracker when available and set this to true
+                    usePreciseJavaTracking = !args.useK2, // TODO: add fir-based java classes tracker when available and set this to true
                     outputFiles = emptyList(),
                     buildHistoryFile = buildHistoryFile,
                     modulesApiHistory = EmptyModulesApiHistory,

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

@@ -12,7 +12,7 @@ import java.io.File
 abstract class AbstractIncrementalFirICLightTreeJvmCompilerRunnerTest : AbstractIncrementalJvmCompilerRunnerTest() {
     override fun createCompilerArguments(destinationDir: File, testDir: File): K2JVMCompilerArguments =
         super.createCompilerArguments(destinationDir, testDir).apply {
-            useFir = true
+            useK2 = true
             useIR = true
             useFirIC = true
             useFirLT = true

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

@@ -23,7 +23,7 @@ import java.io.File
 abstract class AbstractIncrementalFirJvmCompilerRunnerTest : AbstractIncrementalJvmCompilerRunnerTest() {
     override fun createCompilerArguments(destinationDir: File, testDir: File): K2JVMCompilerArguments =
         super.createCompilerArguments(destinationDir, testDir).apply {
-            useFir = true
+            useK2 = true
             useIR = true
         }
 

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

@@ -12,7 +12,7 @@ import java.io.File
 abstract class AbstractIncrementalFirLightTreeJvmCompilerRunnerTest : AbstractIncrementalJvmCompilerRunnerTest() {
     override fun createCompilerArguments(destinationDir: File, testDir: File): K2JVMCompilerArguments =
         super.createCompilerArguments(destinationDir, testDir).apply {
-            useFir = true
+            useK2 = true
             useIR = true
             useFirIC = false
             useFirLT = true