Use call counts to determine which static calls to inline.

Use call counts to determine which static calls to inline.

R=fschneider@google.com

Committed: https://code.google.com/p/dart/source/detail?r=24436

[srdjan, 2013-06-24 23:50:18]

The benchmark results look strange: +70% on Box2DBench, -47% 
ImagingGaussianBlurOnce, 

http://108.170.219.0:8080/Comparison#targetA%3Ddart%3BmachineTypeA%3Dlinux-ia...

http://108.170.219.0:8080/Comparison#targetA%3Ddart%3BmachineTypeA%3Dlinux-x6...

[Florian Schneider, 2013-06-25 08:48:32]

LGTM.

I'd experiment with changing the thresholds since there are now less static call
sites that will be inlined in total.

https://codereview.chromium.org/17646002/diff/1/runtime/vm/flow_graph_inliner.cc
File runtime/vm/flow_graph_inliner.cc (right):

https://codereview.chromium.org/17646002/diff/1/runtime/vm/flow_graph_inliner...
runtime/vm/flow_graph_inliner.cc:762: if ((call_info[call_idx].ratio * 100) <
FLAG_inlining_hotness) {
Maybe we need to adapt the threshold now that static calls are also counted.

[srdjan, 2013-06-25 22:12:58]

Committed patchset #2 manually as r24436 (presubmit successful).

[srdjan, 2013-06-25 22:13:21]

Regression (and improvement) caused by bug in program: fixed with r24433.