[Build] Add utility function to opt-in to ObsoleteDescriptorBasedAPI

compiler/fir/fir2ir/build.gradle.kts

@@ -49,6 +49,7 @@ dependencies {
 }
 
 optInToIrSymbolInternals()
+optInToObsoleteDescriptorBasedAPI()
 
 val generationRoot = projectDir.resolve("tests-gen")
 
@@ -60,14 +61,6 @@ sourceSets {
     }
 }
 
-tasks {
-    named<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>("compileKotlin") {
-        kotlinOptions {
-            freeCompilerArgs += "-opt-in=org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI"
-        }
-    }
-}
-
 if (kotlinBuildProperties.isInJpsBuildIdeaSync) {
     apply(plugin = "idea")
     idea {

compiler/ir/ir.psi2ir/build.gradle.kts

@@ -12,17 +12,9 @@ dependencies {
 }
 
 optInToIrSymbolInternals()
+optInToObsoleteDescriptorBasedAPI()
 
 sourceSets {
     "main" { projectDefault() }
     "test" {}
 }
-
-tasks {
-    named<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>("compileKotlin") {
-        kotlinOptions {
-            freeCompilerArgs += "-opt-in=org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI"
-        }
-    }
-}
-

compiler/ir/serialization.common/build.gradle.kts

@@ -17,16 +17,9 @@ dependencies {
 }
 
 optInToIrSymbolInternals()
+optInToObsoleteDescriptorBasedAPI()
 
 sourceSets {
     "main" { projectDefault() }
     "test" {}
 }
-
-tasks {
-    named<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>("compileKotlin") {
-        kotlinOptions {
-            freeCompilerArgs += "-opt-in=org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI"
-        }
-    }
-}

repo/gradle-build-conventions/buildsrc-compat/src/main/kotlin/tasks.kt

@@ -417,3 +417,7 @@ fun Project.optInToExperimentalCompilerApi() {
 fun Project.optInToIrSymbolInternals() {
     optInTo("org.jetbrains.kotlin.ir.symbols.IrSymbolInternals")
 }
+
+fun Project.optInToObsoleteDescriptorBasedAPI() {
+    optInTo("org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI")
+}