Correctly retain argument value when deopting from Math.round on x64.

Correctly retain argument value when deopting from Math.round on x64.

R=jkummerow@chromium.org
BUG=351624
LOG=N

Committed: https://code.google.com/p/v8/source/detail?r=19896

[Jakob Kummerow, 2014-03-13 12:50:00]

LGTM with nits. Thanks!

https://codereview.chromium.org/199013002/diff/1/src/x64/lithium-codegen-x64.cc
File src/x64/lithium-codegen-x64.cc (right):

https://codereview.chromium.org/199013002/diff/1/src/x64/lithium-codegen-x64....
src/x64/lithium-codegen-x64.cc:3611: Label done, round_to_zero, below_one_half,
do_not_compensate, restore;
We don't need |restore| anymore. And we don't need |do_not_compensate| either
;-)

https://codereview.chromium.org/199013002/diff/1/test/mjsunit/regress/regress...
File test/mjsunit/regress/regress-351624.js (right):

https://codereview.chromium.org/199013002/diff/1/test/mjsunit/regress/regress...
test/mjsunit/regress/regress-351624.js:13: print("input: " + prod);
don't need print() for non-interactive use

https://codereview.chromium.org/199013002/diff/1/test/mjsunit/regress/regress...
test/mjsunit/regress/regress-351624.js:16: if (prod !== backup[0]) throw new
Error("arg!");
use assertEquals(backup[0], prod) here

https://codereview.chromium.org/199013002/diff/1/test/mjsunit/regress/regress...
test/mjsunit/regress/regress-351624.js:24: if (result != -big) {
assertEquals(-big, result)

[Yang, 2014-03-13 13:57:30]

Committed patchset #2 manually as r19896 (presubmit successful).

[Yang, 2014-03-13 13:58:00]

On 2014/03/13 13:57:30, Yang wrote:
> Committed patchset #2 manually as r19896 (presubmit successful).

Thanks for the comments. Addressed.