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arb_texture_view: Test NaN for some RGB32 clears

Nanley Chery requested to merge nchery/piglit:fix/rgbx-iris into master

Before this patch, this test cleared a GL_RGB32F texture to a NaN (0xffffffff), then checked for that exact bit pattern from the texelFetch instruction. It's possible that HW may return a different NaN encoding, so update the clear program to check for NaN instead.

Enables iris to pass this test on gen11+.

Closes: #42 (closed)

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