Improve debug-ability of native method registration

If we fail to register a native we construct a stack trace which needs
Throwable and stack trace support. Registering Throwable's natives first
and making Throwable a root supports this. Previously we could only
generate a stack trace when thread start up was complete.

Change-Id: Icc7c1657988c7f36aceb1d4f3e61e7218f55e055
6 files changed
tree: 7046f25582fd55e6bb4b19bb2fb7781b0d6c60a6
  2. build/
  3. jdwpspy/
  4. src/
  5. test/
  6. tools/