[PATCH] Single function IR dump

[Gerolf Hoflehner]

Hi dexonsmith, echristo,

Dumping the IR of an entire module can take a long time. I found a
patch I wrote a while back that allows me to dump the IR for one function.
It is not pretty but gets the job done. You might find it useful and/or have ideas
to improve it etc.

LTO usage example: -Wl,-mllvm,-dump-function=foo -Wl,-mllvm,-mdump-function=foo
-Wl,-mllvm,-print-before-all

http://reviews.llvm.org/D6326

Files:
  lib/Analysis/IPA/CallGraphSCCPass.cpp
  lib/Analysis/LoopPass.cpp
  lib/CodeGen/MachineFunction.cpp
  lib/CodeGen/MachineFunctionPrinterPass.cpp
  lib/IR/IRPrintingPasses.cpp
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