Add -optimize-for-size flag to optimize for memory size

Add -optimize-for-size flag to optimize for memory size (will be used by pre-aging CL), and remove the is_memory_constrained ResourceConstraint.
    

BUG=292928
R=hpayer@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=16960

[Hannes Payer (out of office), 2013-09-23 11:38:43]

https://codereview.chromium.org/24018009/diff/1/include/v8.h
File include/v8.h (left):

https://codereview.chromium.org/24018009/diff/1/include/v8.h#oldcode3755
include/v8.h:3755: 
Let's keep the last newline

https://codereview.chromium.org/24018009/diff/1/src/flag-definitions.h
File src/flag-definitions.h (right):

https://codereview.chromium.org/24018009/diff/1/src/flag-definitions.h#newcod...
src/flag-definitions.h:226: DEFINE_bool(Os, false, "Optimize for size. Enables
optimizations which reduce "
I just talked to danno: --optimize-for-size is a better name, --Os is to
cryptic.
Moreover, can you make the description generic? This mode should in the future
turn on all kinds of size specific optimizations. And the description should say
that it favors memory size over execution speed.

[rmcilroy, 2013-09-23 12:40:15]

https://codereview.chromium.org/24018009/diff/1/include/v8.h
File include/v8.h (left):

https://codereview.chromium.org/24018009/diff/1/include/v8.h#oldcode3755
include/v8.h:3755: 
On 2013/09/23 11:38:43, Hannes Payer wrote:
> Let's keep the last newline

Done

https://codereview.chromium.org/24018009/diff/1/src/flag-definitions.h
File src/flag-definitions.h (right):

https://codereview.chromium.org/24018009/diff/1/src/flag-definitions.h#newcod...
src/flag-definitions.h:226: DEFINE_bool(Os, false, "Optimize for size. Enables
optimizations which reduce "
On 2013/09/23 11:38:43, Hannes Payer wrote:
> I just talked to danno: --optimize-for-size is a better name, --Os is to
> cryptic.
> Moreover, can you make the description generic? This mode should in the future
> turn on all kinds of size specific optimizations. And the description should
say
> that it favors memory size over execution speed.

Done.

[Hannes Payer (out of office), 2013-09-23 12:45:04]

LGTM, please change the title and the description of the cl

[rmcilroy, 2013-09-23 12:46:04]

On 2013/09/23 12:45:04, Hannes Payer wrote:
> LGTM, please change the title and the description of the cl

I did already ;). Could you land it please.

[rmcilroy, 2013-09-23 12:47:27]

On 2013/09/23 12:46:04, rmcilroy wrote:
> On 2013/09/23 12:45:04, Hannes Payer wrote:
> > LGTM, please change the title and the description of the cl
> 
> I did already ;). Could you land it please.

Opps, but not the title it seems, done now.

[Hannes Payer (out of office), 2013-09-26 09:40:24]

Committed patchset #2 manually as r16960 (presubmit successful).