MIPS: Optimise Math.floor(x/y) to use integer division for MIPS.

MIPS: Optimise Math.floor(x/y) to use integer division for MIPS.

Use div instruction if some divisors do not have magic number.

Based on commit r11427 (318a9598).

BUG=
TEST=

[palfia, 2013-01-09 02:02:24]

Please merge the following CL first to avoid merge conflicts:

https://chromiumcodereview.appspot.com/11783049

[danno, 2013-02-11 15:30:49]

https://codereview.chromium.org/11821013/diff/3001/test/mjsunit/math-floor-of...
File test/mjsunit/math-floor-of-div.js (right):

https://codereview.chromium.org/11821013/diff/3001/test/mjsunit/math-floor-of...
test/mjsunit/math-floor-of-div.js:98: assertEquals(Math.floor(div(k,  13)),
Math.floor(k /  13));
Why this change?

[palfia, 2013-05-09 22:50:09]

Thanks for the review! Sorry, I forgot about this CL somehow. I've uploaded a
new patchset, PTAL.

https://codereview.chromium.org/11821013/diff/3001/test/mjsunit/math-floor-of...
File test/mjsunit/math-floor-of-div.js (right):

https://codereview.chromium.org/11821013/diff/3001/test/mjsunit/math-floor-of...
test/mjsunit/math-floor-of-div.js:98: assertEquals(Math.floor(div(k,  13)),
Math.floor(k /  13));
On 2013/02/11 15:30:50, danno wrote:
> Why this change?

This change is not needed, removed.

[palfia, 2013-06-17 15:10:56]

Closing issue, submitted in: https://codereview.chromium.org/16951016/