Formatting: In @implementation etc lines, put a space before protocol lists.

Don't do this in Google style though:
http://google-styleguide.googlecode.com/svn/trunk/objcguide.xml#Protocols

Most other places (function declarations, variable declarations) still get
this wrong, and since this looks very similiar to template instantiations to
the lexer (`id <MyProtocol> a = ...`), it's going to be hard to fix in some
places.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172099 91177308-0d34-0410-b5e6-96231b3b80d8