implement simple support for arbitrary token lookahead.  Change the 
objc @try parser to use it, fixing a FIXME.  Update the 
objc-try-catch-1.m file to pass now that we get more reasonable 
errors.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@48129 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed