tree ab710ae26fb5afc5d4b1db052173e47f0208ef54
parent 79f2c53f3cb8649c19aeded82f7b8dcc96015808
author Ian Rogers <irogers@google.com> 1397694807 -0700
committer Ian Rogers <irogers@google.com> 1397754988 -0700

Add untested x86-64 downcall and exception assembly.

Change-Id: Ic555f9f5af8c3a2110a92e55772ff6c0128e5c19