Compile fix for f9ef4f6bcd9e.
Compile fix for f9ef4f6bcd9e.

Automatic rebasing didn't pick up that an extra instance of the
EC_SMALLMUL flag was added in commit 8711cf5f341d.

However, that commit also broke CONFIG_ANS, since the CDF
probabilities are not inverted in that case. This patch fixes both
issues.

Change-Id: I85b3eb8a4be5b7a392f2f872fc4a90f3fdbf2727

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom