[PATCH] D24102: [LLVM/Support] - Disallow match() method of llvm::Regex to change object state.

[George Rimar via llvm-commits]

> Maybe just add the warn_unused_result attribute?

Not sure how this helps. Actually main point is that such change allows to make match() as const,
that helps for example if we have a std::vector of them and want to pass it as ArrayRef.

And it is also cleanup itself as there is no point for match() to set object state to error.

George.

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