Setup dist task to assemble libs for compiler distribution.

Produce special stdlib artifact with annotations for dist.
Put js outputs to dist, they're required for JS backend tests.

Use kotlin-compiler for maven, which has all required dependencies bundled.
Clean local directory repository on clean.

Change paths in tests to compiled artifacts.

libraries/tools/kotlin-reflect/build.gradle

@@ -167,11 +167,16 @@ task relocatedSourcesJar(type: Jar) {
     from "${core}/reflection.jvm/src"
 }
 
-artifacts {
-    def artifactJar = [file: file(outputJarPath), builtBy: proguard, name: archivesBaseName]
+def artifactJar = [file: file(outputJarPath), builtBy: proguard, name: archivesBaseName]
 
+artifacts {
     runtime artifactJar
     archives artifactJar
     archives relocatedSourcesJar
     archives javadocJar
 }
+
+dist {
+    from(proguard)
+    from(relocatedSourcesJar)
+}