Added megalooper GM

Here are the sizes (of the skps on disk):

megalooper_0x0: 17KB
megalooper_1x5: 10KB
megalooper_4x2: 38KB

Here are the GPU times (with 256x256 tiling w/ bbh grid):

megalooper_0x0: 300.68
megalooper_1x5: 348.67
megalooper_4x2: 330.23

Here are the raster times (same setup):

megalooper_0x0: 91.65
megalooper_1x5: 125.75
megalooper_4x2: 94.11

Here are the times w/o the trailing "original" rect:

gpu:
megalooper_0x0: 300.85
megalooper_1x4: 344.24
megalooper_4x1: 314.13

raster:
megalooper_0x0: 92.72
megalooper_1x4: 125.89
megalooper_4x1: 92.44

[robertphillips, 2013-06-03 16:24:58]

I actually would like to add this as a GM to capture mega-looper regressions as
I attempt to accelerate the gpu path.

[bsalomon, 2013-06-03 16:42:01]

On 2013/06/03 16:24:58, robertphillips wrote:
> I actually would like to add this as a GM to capture mega-looper regressions
as
> I attempt to accelerate the gpu path.

I think I missed some conversation you guys had about adding this, but lgtm.

[robertphillips, 2013-06-03 17:13:39]

committed as r9409