Allow inlining of closures with a context change.

Allow inlining of closures with a context change.

This CL removes the remaining missing cases when inlining closure
calls.

In order to benefit for code using forEach, I added GrowableObjectArray.forEach
to the functions that should always be inlined.

I also renamed BuildLoadContext/BuildStoreContext helpers in the flow
graph builder to better match what they do.

R=srdjan@google.com

Committed: https://code.google.com/p/dart/source/detail?r=25551

[srdjan, 2013-07-19 16:40:34]

lgtm

[Florian Schneider, 2013-07-29 09:45:30]

Committed patchset #1 manually as r25551 (presubmit successful).