Add flag --always_cleared_ic_data, which forces a cleared ICData to be emitted with each IC call (i…

Add flag --always_cleared_ic_data, which forces a cleared ICData to be emitted with each IC call (instead of propagating the ICData from unoptimized to optimized code). This addresses Kevin's concern that propagating the ICData may hurt performance when inlining methods as the IC calls of inlined methods may not need all classes as the unoptimized code. Currently running with cleared ICData slows dart2js by > 2%, probably because the ICData has to be repopulated by optimized code through calls to runtime. Adding the flag for experimenting as we work on inlining strategies and megamorphic calls.
Committed: https://code.google.com/p/dart/source/detail?r=14367

[regis, 2012-10-31 00:24:28]

LGTM

However, the name "always_cleared_ic_data" sounds confusing to me, as it does
not contain a verb.

How about --propagate_ic_data with the reverse default value and meaning?

[srdjan, 2012-10-31 19:49:15]

On 2012/10/31 00:24:28, regis wrote:
> LGTM
> 
> However, the name "always_cleared_ic_data" sounds confusing to me, as it does
> not contain a verb.
> 
> How about --propagate_ic_data with the reverse default value and meaning?

Renamed to propagate_ic_data