[Intel-gfx] [PATCH] drm/i915: Use BUILD_BUG if possible in the i915 WARN_ON

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  364/364              364/364
ILK              +1-3              364/366              362/366
SNB                                  448/450              448/450
IVB                                  497/498              497/498
BYT                                  289/289              289/289
HSW                                  563/564              563/564
BDW                                  417/417              417/417
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
 ILK  igt_kms_flip_blocking-absolute-wf_vblank-interruptible      DMESG_WARN(1, M26)PASS(2, M26)      DMESG_WARN(1, M26)
*ILK  igt_kms_flip_busy-flip-interruptible      PASS(3, M26)      DMESG_WARN(1, M26)
*ILK  igt_kms_flip_flip-vs-rmfb-interruptible      PASS(3, M26)      DMESG_WARN(1, M26)
 ILK  igt_kms_flip_wf_vblank-ts-check      DMESG_WARN(1, M26)PASS(6, M26M37)      PASS(1, M26)
Note: You need to pay more attention to line start with '*'