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/InterfaceField.txt

@@ -0,0 +1,12 @@
+package test
+
+public fun implementInterface(): test.InterfaceField
+public fun useField(): kotlin.String
+public fun useFunc(): kotlin.String!
+
+public interface InterfaceField {
+    public abstract fun func(): kotlin.String!
+
+    // Static members
+    public const final val STRING: kotlin.String
+}