Use parallel move resolver for optimized try-catch.

Use parallel move resolver for optimized try-catch.

This CL has no change in functionality and is purely clean up and
refactoring. Instead of manually generating the moves at throwing
instructions in try-catch, construct a parallel move and use the resolver
to emit the native code. This eliminates a lot of duplicated code
from all platforms.

It will also allow to re-use stack space that is currently allocated
separately for each individual try-catch in a function.

I added a few more unrelated minor changes in various parts of the VM
* Simpilify guard code generation
* Resolve refactoring TODO in deoptimization
* Improve names

R=johnmccutchan@google.com

Committed: https://code.google.com/p/dart/source/detail?r=31326

[Florian Schneider, 2013-12-19 13:18:02]

Corrected reviewer email.

[Cutch, 2013-12-19 14:46:04]

lgtm

[Florian Schneider, 2013-12-20 09:41:53]

Committed patchset #1 manually as r31326 (presubmit successful).