Change Math.random() to return 32 bits of random goodness, instead of 30 rand...

Change Math.random() to return 32 bits of random goodness, instead of 30 random bits.  Math.random now allocates a HeapNumber inline, and calls a C funciton directly to put the random bits into it.

Committed: http://code.google.com/p/v8/source/detail?r=4354

[William Hesse, 2010-04-06 14:51:39]

Other JavaScript implementations return 32 random bits from Math.random.  This
changes makes us do the same.  Erik - could you look at the ARM version? 
bug=558
(http://code.google.com/p/v8/issues/detail?id=558)

[Erik Corry, 2010-04-06 14:57:50]

ARM part LGTM

[Rico, 2010-04-07 07:36:32]

LGTM
Maybe we should also add it to the mips architecture as unimplemented (I am not
sure if we consistently do this)

http://codereview.chromium.org/1599019/diff/1/15
File src/math.js (right):

http://codereview.chromium.org/1599019/diff/1/15#newcode168
src/math.js:168: return %_GenerateRandomHeapNumber();
_MathRandom to be more consistent with the other math functions? (also avoids
the GenerateGenerate in codegen)

[William Hesse, 2010-04-07 08:17:03]

Also renamed the functions on the Mips platform.

http://codereview.chromium.org/1599019/diff/1/15
File src/math.js (right):

http://codereview.chromium.org/1599019/diff/1/15#newcode168
src/math.js:168: return %_GenerateRandomHeapNumber();
Changed to RandomHeapNumber, to avoid the GenerateGenerate.

On 2010/04/07 07:36:32, Rico wrote:
> _MathRandom to be more consistent with the other math functions? (also avoids
> the GenerateGenerate in codegen)

[William Hesse, 2010-04-07 08:18:13]

Also renamed the functions on the Mips platform.