Attempt to continue after the JDT compiler aborts.

This could occasionally work, but in my test case it just causes a
RuntimeException later due to violating an internal JDT invariant. Still, it
lets us print the names of a few more source files of death before dying.

Change-Id: Ia94d998c6b4e56d880570c726aa09f004a4f552c
Review-Link: https://gwt-review.googlesource.com/#/c/2271/

Review by: mdempsky@google.com