[PATCH] Add new LLVM_OPTIMIZED_TABLEGEN build setting which configures, builds and uses a release tablegen build when LLVM is configured with assertions enabled.

[Mehdi AMINI]

Why not defaulting to ON? 
I expect that debugging tablegen itself is not very common and we may want the default to optimize for the common case?


http://reviews.llvm.org/D7349

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