Simplify and fix code aging.

Simplify and fix code aging.

Making the code size predictable is hard, and to make things even more
complicated, the start of a function can contain various stuff like calls to a
profiling hook, receiver adjustment or dynamic frame alignment. Instead of
tackling all these problems separately, we now simply record the offset where
patching should happen later in the Code object itself.

Committed: http://code.google.com/p/v8/source/detail?r=13081

[danno, 2012-11-28 16:38:54]

lgtm with a nit!

https://codereview.chromium.org/11316218/diff/4001/src/objects.h
File src/objects.h (right):

https://codereview.chromium.org/11316218/diff/4001/src/objects.h#newcode4328
src/objects.h:4328: // [prologue_offset]: Offset of the prologue, used for IC
aging.
"IC" isn't correct, it's actually used for FUNCTIONs and OPTIMIZED_FUNCTIONs

[Sven Panne, 2012-11-29 07:38:17]

Landing...

https://codereview.chromium.org/11316218/diff/4001/src/objects.h
File src/objects.h (right):

https://codereview.chromium.org/11316218/diff/4001/src/objects.h#newcode4328
src/objects.h:4328: // [prologue_offset]: Offset of the prologue, used for IC
aging.
On 2012/11/28 16:38:54, danno wrote:
> "IC" isn't correct, it's actually used for FUNCTIONs and OPTIMIZED_FUNCTIONs

Done.