clang-format: distinguish ObjC call subexpressions after r355434
The revision r355434 had the unfortunate side-effect that it started to
recognize certain ObjC expressions with a call subexpression followed by a
a->b subexpression as C++ lambda expressions.
This patch adds a bit of logic to handle these cases and documents them in
The commented-out test cases in the new test suite are ones that were
problematic before r355434.
Reviewers: MyDeveloperDay, gribozavr
Reviewed By: MyDeveloperDay, gribozavr
Subscribers: MyDeveloperDay, cfe-commits
Differential Revision: https://reviews.llvm.org/D59210