Moved the reference checking to java.g

src/checkstyle/com/puppycrawl/tools/checkstyle/java.g

@@ -853,7 +853,7 @@ postfixExpression
 		(	// qualified id (id.id.id.id...) -- build the name
 			DOT^ ( IDENT {ver.reportReference(sFirstIdent);}
 				| "this"
-				| "class"
+				| "class" {ver.reportReference(sFirstIdent);}
 				| newExpression
 				| "super" // ClassName.super.field
 				)

src/checkstyle/com/puppycrawl/tools/checkstyle/java.tree.g

@@ -408,7 +408,7 @@ primaryExpression
                 (i2:IDENT { firstExprIdent = null;}
                 | arrayIndex
                 | "this"
-                | "class" { if (firstExprIdent != null) { ver.reportReference(firstExprIdent.getText()); } }
+                | "class"
                 |  #( "new" IDENT elist )
 				|   "super"
                 )