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arb_blend_func_extended: Add test checking corruption on BSW/BDW

Danylo Piliaiev requested to merge GL/piglit:test/dual-src-blending-issue-1917 into master

Test exercises a bug on BSW/BDW Intel platforms originally found in skia tests.

  1. Draw discarding some pixels
  2. Enable dual source blending
  3. Draw with shader without discards using dual src blending
  4. As a result some pixels in the region of the first draw may be corrupted

One iteration may not reproduce the issue; with current value of 100 iterations the test didn't pass a single time running in a loop for more than an hour.

mesa#1917 (closed)

@tpalli @majanes

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