Improve constant propagation for type arguments.

Improve constant propagation for type arguments.

The instruction to extract type arguments are now fully supported
in constant propagation.

I also added cid-information to non-instance constants (like e.g.
type arguments).  This will enable more opportunities
for allocation sinking because it requires the type arguments to
 be known constant.

R=srdjan@google.com

Committed: https://code.google.com/p/dart/source/detail?r=32489

[srdjan, 2014-02-10 10:10:07]

lgtm

[Florian Schneider, 2014-02-10 10:30:15]

Committed patchset #1 manually as r32489 (presubmit successful).