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/InterfaceMemberClass.txt

@@ -0,0 +1,11 @@
+package test
+
+private fun useInterfaceMemberClass(): kotlin.String!
+
+public/*package*/ interface InterfaceMemberClass {
+
+    public open class MemberClass {
+        public constructor MemberClass()
+        public open fun func(): kotlin.String!
+    }
+}