[PATCH] Review: Add Cmake Options to disable target components (AsmParser, InstPrinter, Disassembler)

[Aditya Nandakumar]

Hi

I have attached a patch which accepts CMAKE options to disable target specific components. Also attached is a patch for changes required for the R600 target. This can save megabytes in released binaries
Eg usage :
cmake -DLLVM_TARGETS_TO_BUILD="R600" -G "Ninja" -DCMAKE_BUILD_TYPE=Release ../llvm/ -DLLVM_TARGETS_DISABLE_INST_PRINTER=“R600”
llvm-build and llvm-lit has been updated as well.

Additional options to Cmake are 
-DLLVM_TARGETS_DISABLE_DISASSEMBLER=“…” and 
-DLLVM_TARGETS_DISABLE_PARSER=“…”

I request you to kindly review this change.


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Thanks
Aditya Nandakumar