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/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JVMCompilerArguments.java

@@ -137,6 +137,16 @@ public class K2JVMCompilerArguments extends CommonCompilerArguments {
     )
     public String[] scriptResolverEnvironment;
 
+    // Javac options
+    @Argument(value = "-Xuse-javac", description = "Use javac for Java source and class files analysis")
+    public boolean useJavac;
+
+    @Argument(
+            value = "-Xjavac-arguments",
+            valueDescription = "<option[,]>",
+            description = "Java compiler arguments")
+    public String[] javacArguments;
+
     // Paths to output directories for friend modules.
     public String[] friendPaths;