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/compileJavaAgainstKotlin/method/Any.kt

@@ -1,4 +1,4 @@
 package test
 
 // extra parameter is to preserve generic signature
-fun anyany(a: Any, ignore: java.util.List<String>) = a
+fun anyany(a: kotlin.Any, ignore: java.util.List<String>) = a