Return nBytes instead of nextAddr from utf8DecodeChar

Summary:
While researching D176, I came across the following simplification
opportunity:

Not all functions that call utf8DecodeChar actually need the address
of the next char. And some need the 'number of bytes' read. So returning
nBytes instead of nextAddr should save a few addition and subtraction
operations, and makes the code a bit simpler.

Test Plan: it validates

Reviewers: simonmar, ezyang, austin

Reviewed By: austin

Subscribers: simonmar, ezyang, carter

Differential Revision: https://phabricator.haskell.org/D179

0 files changed, 0 insertions, 0 deletions