[PATCH] clang-format: Support @autoreleasepool.

[strager]

> The case body is mostly the same as for case tok::objc_synchronized – could they share the same code? (the paren code would just never run for autoreleasepool)


The same could be said for `while` and maybe `if` and `for`, too.

Testing `@autoreleasepool (foo) {` and not testing `@autoreleasepool {` doesn't make sense anyway.


http://reviews.llvm.org/D10372

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