ubsan shift fixes

Use an inline function that does a normal shift. When built for the sanitizer, add casts so that the shift is unsigned.

Also make a few fixes to do unsigned shifts or avoid the shift altogether; and add an argument spec to some macros.

R=reed@google.com,mtklein@google.com
BUG=skia:4633

Review URL: https://codereview.chromium.org/1503423003
19 files changed