Improve code generation for the HRandom instruction.

Improve code generation for the HRandom instruction.

Since the per-context random number generator is now
properly seeded upon context creation, we do not need
to check for lazy-initialization anymore, and so we
can implement the HRandom instruction w/o having to
call into the C function (which means we don't need
to MarkAsCall anymore).

TEST=cctest/test-random
R=yangguo@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=16684

[Benedikt Meurer, 2013-09-12 09:36:14]

Hey Yang,
This is the improved HRandom implementation we were talking about offline.
PTAL.
-- Benedikt

[Yang, 2013-09-12 11:48:22]

lgtm.

https://codereview.chromium.org/23478031/diff/1/src/arm/lithium-codegen-arm.cc
File src/arm/lithium-codegen-arm.cc (right):

https://codereview.chromium.org/23478031/diff/1/src/arm/lithium-codegen-arm.c...
src/arm/lithium-codegen-arm.cc:3916: // r1: state[0].
these comments are obsolete now.

[Benedikt Meurer, 2013-09-12 12:11:50]

https://codereview.chromium.org/23478031/diff/1/src/arm/lithium-codegen-arm.cc
File src/arm/lithium-codegen-arm.cc (right):

https://codereview.chromium.org/23478031/diff/1/src/arm/lithium-codegen-arm.c...
src/arm/lithium-codegen-arm.cc:3916: // r1: state[0].
On 2013/09/12 11:48:22, Yang wrote:
> these comments are obsolete now.

Done.

[Benedikt Meurer, 2013-09-12 12:12:22]

Committed patchset #3 manually as r16684 (presubmit successful).