[PATCH] D24027: [LLVM/Support] - Make match() method of llvm::Regex to be const

[George Rimar via llvm-commits]

>(or remove the side-channel error handling, and have the APIs return errors explicitly instead - the side channel's likely to be accidentally unchecked by many callers, >which is probably a mistake)

This will require many changes in places uses Regex in llvm code. At the same time I am not sure it is worth doing
that as we might want to switch to std::regex as soon as compilers versions we support implements that.
I would probably leave it as is then.

George.
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