- Add "AV" as new default acronym. - Add support for "I" and "A" in lowerCamelCase pattern

Summary: Now we can support property names like "hasADog" correctly.

Reviewers: benhamilton, hokein

Reviewed By: benhamilton

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D48039

llvm-svn: 334448