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/AnnotationWithField.java

@@ -0,0 +1,9 @@
+package test;
+
+public @interface AnnotationWithField {
+
+    String text();
+
+    int ANSWER = 42;
+
+}