Print deoptimization index when printing lithium environment.

Output of --trace-deopt --code-comments does not always allow to reliably match deoptimization to the lithium instruction (and it is actually never accurate on x64 due to one level of indirection). This change allows to reliably figure out which instruction deoptimized just by looking up bailout id in the hydrogen.cfg.

R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/12217103

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@13639 ce2b1a6d-e550-0410-aec6-3dcde31c8c00