[PATCH] CMake: optionaly enable LLVM to be compile with -std=c++11 (default: OFF)

[Arnaud Allard de Grandmaison]

In some cases, like when building llvm+lldb with cmake, llvm has to be
built in c++11 mode. This patch adds the handling of this option. The
default is OFF for now, but I suspect it will move to ON pretty soon given
the discussions on the move to c++11 for the llvm codebase.

This patch seems pretty safe for me to apply, but some may have remarks
about the best way to do it.

Cheers,
--
Arnaud A. de Grandmaison
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