[Patch] Make llvm::Regex non-copyable

[Maciej Piechotka]

The current implementation of llvm::Regex does not support copy
construction of it's values. However it is not enforced so copying
llvm::Regex leads to crash (well - technically undefined behaviour as
free'd memory is accessed and then freed once again).

Attached patch makes llvm::Regex non-copyable but adds the move
constructor for C++11.

Best regards
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