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

[Akira Hatanaka]

Hi dexonsmith,

Currently, when we merge two triples that differ only in the minimum version number, we give a warning such as:

WARNING: Linking two modules of different target triples: 'thumbv7-apple-ios8.0.0' and 'thumbv7-apple-ios3.0.0'

This patch fixes LinkModules to stop warning and pick the triple with the larger version number in such case.

rdar://problem/16743513

http://reviews.llvm.org/D7591

Files:
  include/llvm/ADT/Triple.h
  lib/Linker/LinkModules.cpp
  test/Linker/apple-version0.ll
  test/Linker/apple-version1.ll
  test/Linker/apple-version2.ll
  test/Linker/apple-version3.ll

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