[PATCH] Fix for nasty LTO issue that's most obvious in ObjectiveC.

[Kevin Frei]

[Responding to feedback]
Updated the test case to be better directed (specifically testing externally_initialized and appending attributes). Moved the fix to be in GlobalVariable::copyAttributesFrom instead of at the copy site.

http://reviews.llvm.org/D6145

Files:
  lib/IR/Globals.cpp
  test/Linker/lto-attributes.ll
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