[llvm] Implement *BasicBlockPass::createPrinterPass method

[Sergei Larin]

Hello everyone,

  I am not precisely sure who owns this code (lib/IR/Pass.cpp ...sorry...),
and I am not sure why to this moment we did not have
BasicBlockPass::createPrinterPass() defined, but I got a nasty surprise when
trying to combine -mllvm -print-after-all with -mllvm -vectorize for
clang... 

   The implementation seemed straightforward, so I just decided to do it and
then ask for background later. So... If it is as harmless as I think it is,
please review and OK the patch. If it should not be done for some reason, or
should be implemented differently, please let me know.

Thanks a lot.

Sergei Larin

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