RFR [15] 8245841: Remove unused com.sun.tools.javac.comp.Modules.XMODULES_PREFIX

[Pavel Rappo]

Please review this trivial patch:

diff --git a/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Modules.java b/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Modules.java
--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Modules.java
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Modules.java
@@ -215,8 +215,6 @@
         limitModsOpt = options.get(Option.LIMIT_MODULES);
         moduleVersionOpt = options.get(Option.MODULE_VERSION);
     }
-    //where
-        private static final String XMODULES_PREFIX = "-Xmodule:";
 
     int depth = -1;

My IDE shows that this field is unused and the tests on our CI system agree with it. The field is probably a leftover from "8182162: Remove -XD-Xmodule". 

-Pavel