[PATCH] Fix LLVM_OPTIMIZED_TABLEGEN CMake option

[Mehdi AMINI]

I am trying to get the option LLVM_OPTIMIZED_TABLEGEN robust, it sometimes disappear from my build dir.

We discussed about that on llvm-commits last month and I wrote you:
"My impression is that if the NATIVE subdirectory is created while running cmake on the parent directory, it will be correctly create with CMAKE_BUILD_TYPE=RELEASE.  If does not exist when running ninja, it is created and configured without the parameters." At that time you were considering this as an issue and not a feature since you told me: "Sounds like you have a handle on the issue. Patches welcome :-)."


http://reviews.llvm.org/D8981

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