[PATCH] D13614: [Extension] Optimizing passed by-value const objects.

[Richard Smith via cfe-commits]

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This revision is now accepted and ready to land.

This looks fine (subject to the observation in http://reviews.llvm.org/D13603 that `MarkWriteOnceWrittenRAII` can just be a function rather than an RAII class type).


http://reviews.llvm.org/D13614