JDK 10 RFR of JDK-8173595: Update TestSourceVersion once VERSION_MAJOR is updated to 10

[joe darcy]

Hello,

Now that VERSION_MAJOR has been updated to 10 (JDK-8029942), the test

     tools/javac/processing/model/TestSourceVersion.java

should be updated in its testing of SourceVersion.latestSupported(). 
Patch below.

Thanks,

-Joe

--- a/test/tools/javac/processing/model/TestSourceVersion.java Fri Jan 
27 16:22:08 2017 -0800
+++ b/test/tools/javac/processing/model/TestSourceVersion.java Fri Feb 
03 00:15:13 2017 -0800
@@ -45,7 +45,7 @@

      private static void testLatestSupported() {
          if (SourceVersion.latest() != RELEASE_10 ||
-            SourceVersion.latestSupported() != RELEASE_9)
+            SourceVersion.latestSupported() != RELEASE_10)
              throw new RuntimeException("Unexpected release value(s) 
found:\n" +
                                         "latest:\t" + 
SourceVersion.latest() + "\n" +
                                         "latestSupported:\t" + 
SourceVersion.latestSupported());