IC: add destination dir to start of classpath instead of end

Otherwise IC fails when a project declares a class with the same name
as in one of its dependencies.
The issue is relevant only for non-JPS IC (Gradle, Maven, etc.),
but I added the test for JPS too.

  #KT-20516 fixed

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

@@ -314,7 +314,9 @@ class IncrementalJvmCompilerRunner(
     override fun preBuildHook(args: K2JVMCompilerArguments, compilationMode: CompilationMode) {
         when (compilationMode) {
             is CompilationMode.Incremental -> {
-                args.classpathAsList += args.destinationAsFile.apply { mkdirs() }
+                val destinationDir = args.destinationAsFile
+                destinationDir.mkdirs()
+                args.classpathAsList = listOf(destinationDir) + args.classpathAsList
             }
             is CompilationMode.Rebuild -> {
                 // there is no point in updating annotation file since all files will be compiled anyway