Revert "Support overwriting an arbitrary number of literal bits."

This reverts commit 133c57c331f3b1806233fbd83db1f5f022b1490a,
which appears to cause test failures in
AV1/AVxEncoderThreadTest.EncoderResultTest/*

Change-Id: I200b7a135ed65dc2c3f23b23b8c3dbf0872715fa
1 file changed