[Intel-gfx] functionality case for GL_APPLE_object_purgeable

[Ian Romanick]

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Shuang He wrote:

>     I have come out a simple and loose criteria for it. It's simply that
> "the lighter memory stress, the bigger object retain rate".
>     The piglit case is attached for review. According to the testing
> result of this case, it's working well.

I'm going to review the tests this week.  I skimmed over them briefly
when you sent them out, but I was traveling and forgot about them. :)

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