Add dehoisting to the string printout of hydrogen and lithium instructions.

Add dehoisting to the string printout of hydrogen and lithium instructions.
This is nice when looking at hydrogen graphs, to see the real key offset.

R=mmassi@chromium.org
BUG=

Committed: https://code.google.com/p/v8/source/detail?r=13032

[mvstanton, 2012-11-21 12:39:00]

Hi Massi,
Here is the small change I mentioned a few days ago, to print the key dehoisting
in hydrogen output. I've verified that it doesn't confuse the c1visualizer to
see <OBJ>[<KEY> + <number>]. It can still find all usages of <KEY>.

[Massi, 2012-11-22 09:42:55]

lgtm