[PATCH] Modularizing LICM

[Ashutosh Nema]

Thanks Hal, Philip & Bruno for review.

Incorporated review comments.

Changes in this patch:

1. Introduced 'LICMSafetyInfo', earlier 'MayThrow' & 'HeaderMayThrow' was exposed outside. But now 'SinkRegion', 'HoistRegion' and 'PromoteAliasSet' will compute safety information.
2. Removed newly included headers in 'LoopUtils.h' Instead used forward declaration.
3. Corrected indentation issues.
4. Corrected comments to function by removing function names.
5. Earlier return status of 'PromoteAliasSet' was not getting used, corrected to set 'Changed'.

Please check updated changes, your suggestions and comments are welcome.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7291

Files:
  include/llvm/Transforms/Utils/LoopUtils.h
  lib/Transforms/Scalar/LICM.cpp

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