Handle semantic name in Java source code

This is the cheapest way to do it. There is no worry about
correctness, as the code will be compiled by javac again.

Author: liufengyun

compiler/src/dotty/tools/dotc/parsing/JavaParsers.scala

@@ -5,7 +5,7 @@ package parsing
 import dotty.tools.dotc.core.Constants.Constant
 import dotty.tools.dotc.core.Flags
 import dotty.tools.dotc.core.Flags.FlagSet
-
+import dotty.tools.dotc.core.NameOps.moduleClassName
 
 import JavaTokens._
 import JavaScanners._
@@ -206,7 +206,9 @@ object JavaParsers {
       if (in.token == IDENTIFIER) {
         val name = in.name
         in.nextToken()
-        name
+        if name(name.length - 1) == '$'
+        then name.slice(0, name.length - 1).moduleClassName
+        else name
       }
       else {
         accept(IDENTIFIER)
@@ -285,6 +287,8 @@ object JavaParsers {
           if name(0) >= 'A' && name(0) <= 'Z'
           then name.toTypeName
           else name.toTermName
+        case _ => // semantic name from `O$`
+          name.toTermName
 
       optArrayBrackets {
         if (in.token == FINAL) in.nextToken()