Use a stack variable for hash computation in GrBinHashKey

[bsalomon, 2011-12-12 22:11:29]

VS2010 compiler skips a rountrip through memory.

[bsalomon, 2011-12-12 22:33:34]

On 2011/12/12 22:11:29, bsalomon wrote:
> VS2010 compiler skips a rountrip through memory.

[TomH, 2011-12-12 22:34:11]

LGTM