cherry-pick 0a0368368 Check the conformance requirements in Sec. 6.8.1.

fixes a segfault with a malformed bitstream

+ correct README.version to have the right base commit and local
modifications

Bug: 166268541
Test: aomdec + sargo hwsan
Merged-In: I558248e2a0b4cfc4bc3d7c42c80505d82fb9804f
Change-Id: Ib39bcdd0d2d397711216430ab3d13a4bb62d6508
3 files changed