[PATCH] An Assumption-Tracking Pass

[hfinkel at anl.gov]

Hi chandlerc, reames, atrick,

This patch adds an immutable pass, AssumptionTracker, which keeps a cache of @llvm.assume instructions within a module. It uses callback value handles to keep stale functions and intrinsics out of the map, and it relies on any code that creates new @llvm.assume calls to notify it of the new instructions. The benefit is that code needing to find @llvm.assume intrinsics can do so directly, without scanning the function, thus allowing the cost of @llvm.assume handling to be negligible when none are present.

I apologize ahead of time: Some of the patches in this series now depend on each other in odd ways. You probably can't compile them unless you apply them all.

http://reviews.llvm.org/D4689

Files:
  include/llvm/Analysis/AssumptionTracker.h
  include/llvm/InitializePasses.h
  lib/Analysis/AssumptionTracker.cpp
  lib/Analysis/CMakeLists.txt
  lib/Transforms/InstCombine/InstCombine.h
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  lib/Transforms/InstCombine/InstructionCombining.cpp
  lib/Transforms/Scalar/LoopUnswitch.cpp
  lib/Transforms/Utils/InlineFunction.cpp
  lib/Transforms/Utils/LoopUnroll.cpp
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