Get rid of the "spare buffer" cache.

Get rid of the "spare buffer" cache.

BUG=
R=ishell@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=22943

[Toon Verwaest, 2014-08-06 16:44:28]

PTAL

[Igor Sheludko, 2014-08-06 16:52:08]

lgtm

https://codereview.chromium.org/446923002/diff/1/src/arm/assembler-arm.cc
File src/arm/assembler-arm.cc (right):

https://codereview.chromium.org/446923002/diff/1/src/arm/assembler-arm.cc#new...
src/arm/assembler-arm.cc:3227: // Switch buffers.
Obsolete comment.

https://codereview.chromium.org/446923002/diff/1/src/arm64/assembler-arm64.cc
File src/arm64/assembler-arm64.cc (right):

https://codereview.chromium.org/446923002/diff/1/src/arm64/assembler-arm64.cc...
src/arm64/assembler-arm64.cc:2799: // Switch buffers.
Same here.

[Toon Verwaest, 2014-08-06 16:57:02]

Committed patchset #1 manually as 22943 (presubmit successful).

[Sven Panne, 2014-08-07 06:47:48]

Nice! This has been on my ToDo list for ages, and I almost forgot it. :-) After
this, I think it's worthwhile to disentangle the Assembler and Isolate further:
Conceptually, there is no need for an Isolate to assemble something, but I fear
that Assembler (just like Zone) is often abused to pass around the Isolate.
Anyway, breaking this dependency would make unit testing things much easier.

[Benedikt Meurer, 2014-08-07 06:54:07]

On 2014/08/07 at 06:47:48, svenpanne wrote:
> Nice! This has been on my ToDo list for ages, and I almost forgot it. :-)
After this, I think it's worthwhile to disentangle the Assembler and Isolate
further: Conceptually, there is no need for an Isolate to assemble something,
but I fear that Assembler (just like Zone) is often abused to pass around the
Isolate. Anyway, breaking this dependency would make unit testing things much
easier.

s/much easier/possible/