[PATCH] [LinkModules] Intelligently merge triples that differ only in the minimum version number if the vendor is apple

[Akira Hatanaka]

Address review comments.

In summary, this patch makes the following changes:

- Change ModuleLinker to stop issuing a warning when the Triple objects compare equal even when the triple strings differ.
- On Apple platforms, choose the triple that has the larger version number.


http://reviews.llvm.org/D7591

Files:
  include/llvm/ADT/Triple.h
  lib/Linker/LinkModules.cpp
  lib/Support/Triple.cpp
  test/Linker/Inputs/apple-version/1.ll
  test/Linker/Inputs/apple-version/2.ll
  test/Linker/Inputs/apple-version/3.ll
  test/Linker/Inputs/apple-version/4.ll
  test/Linker/Inputs/targettriple-a.ll
  test/Linker/Inputs/targettriple-b.ll
  test/Linker/Inputs/targettriple-c.ll
  test/Linker/apple-version.ll
  test/Linker/targettriple.ll

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