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i915 regressions in swrast pack/unpack span code

Piglit's bin/arb_point_parameters-point-attenuation -auto -fbo and bin/linestipple -auto are both crashing on master. Reverting 9c38cbbb, 23bb92c4, f1403d66 fixes the crashes.

The issue is that put_values has srb->RowStride == -512, but passes it to util_format_write_4ub which expects an unsigned stride, so the destination pointer gets wildly out of range.

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