[PATCH] IR: Move the slot tracker out of AsmWriter into a separate public module.

[Alex Lorenz]

Hi dexonsmith, bob.wilson, bogner,

This patch moves the SlotTracker class out of AsmWriter.cpp into a separate module that's publicly accessible.

This patch would be useful for MIR Serialization, in particular it would enable the MIR parser to parse metadata machine operands. The metadata machine operands are serialized using the familiar '!' <slot> notation, and the MIR parser has to be able to map from slot numbers to the actual metadata nodes. The SlotTracker class would allow the MIRParser to create this mapping.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10517

Files:
  include/llvm/IR/SlotTracker.h
  lib/IR/AsmWriter.cpp
  lib/IR/CMakeLists.txt
  lib/IR/SlotTracker.cpp

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