Fix symbol printing in migration / generalization tracing

BUG=
R=ishell@chromium.org

Review URL: https://codereview.chromium.org/176713006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19636 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix A64 after 19635.

TBR=yangguo@chromium.org

Review URL: https://codereview.chromium.org/184103013

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19637 ce2b1a6d-e550-0410-aec6-3dcde31c8c00