Introduce experimental -Xuse-javac compilation mode

In this mode, javac AST and Symbol files are used during
Kotlin compilation instead of PSI / binary stuff.
Later, they are reused for Java file compilation.
javac in this mode is integrated into kotlinc.

compiler/testData/compileKotlinAgainstJava/SimpleAnnotation.txt

@@ -0,0 +1,7 @@
+package test
+
+@test.SimpleAnnotation private fun withSimpleAnnotation(): kotlin.Unit
+
+@kotlin.annotation.Target(allowedTargets = {AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER}) public final annotation class SimpleAnnotation : kotlin.Annotation {
+    public constructor SimpleAnnotation()
+}