Fix crash with --trace-deoptimization-verbose and tweak formatting.

Fix crash with --trace-deoptimization-verbose and tweak formatting.

Uninitialized instances (e.g. closures) can't be printed using ToCString.
Print just the class instead.

Print values/addresses consistently with our disassembly output (no leading zeros)
This makes searching in the trace output easier.

Limit printing source lines to max 80 chars. Otherwise the trace output for
minified Dart code gets unreadable.

R=srdjan@google.com

Committed: https://code.google.com/p/dart/source/detail?r=41134

[Florian Schneider, 2014-10-15 14:14:45]

fschneider@google.com changed reviewers:
+ srdjan@google.com

[srdjan, 2014-10-15 15:40:47]

lgtm

[Florian Schneider, 2014-10-15 15:49:45]

Committed patchset #1 (id:1) manually as r41134 (presubmit successful).