Misc: Protect freeArgs with FreezableVar

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/compilerRunner/GradleKotlinCompilerRunner.kt

@@ -120,7 +120,7 @@ internal class GradleCompilerRunner(private val project: Project) : KotlinCompil
             args: K2JSCompilerArguments,
             environment: GradleCompilerEnvironment
     ): ExitCode {
-        args.freeArgs.addAll(kotlinSources.map { it.absolutePath })
+        args.freeArgs += kotlinSources.map { it.absolutePath }
         return runCompiler(K2JS_COMPILER, args, environment)
     }
 
@@ -129,7 +129,7 @@ internal class GradleCompilerRunner(private val project: Project) : KotlinCompil
             args: K2MetadataCompilerArguments,
             environment: GradleCompilerEnvironment
     ): ExitCode {
-        args.freeArgs.addAll(kotlinSources.map { it.absolutePath })
+        args.freeArgs += kotlinSources.map { it.absolutePath }
         return runCompiler(K2METADATA_COMPILER, args, environment)
     }
 

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/dsl/optionsUtil.kt

@@ -21,5 +21,5 @@ import org.jetbrains.kotlin.cli.common.arguments.CommonToolArguments
 fun KotlinCommonToolOptions.copyFreeCompilerArgsToArgs(args: CommonToolArguments) {
     // cast to List<Any> is important because in Groovy a GString can be inside of a list
     val freeArgs = (freeCompilerArgs as List<Any>).map(Any::toString)
-    args.freeArgs.addAll(freeArgs)
+    args.freeArgs += freeArgs
 }