[PATCH] Link jumptable attributes consistently with unnamed_addr

[Tom Roeder]

This patch changes the module linker to not unset unnamed_addr on merged functions that have the jumptable attribute. As the test case demonstrates, this can happen with a declaration that has no jumptable attribute and no unnamed_addr when it is linked with a defined function that has both.

http://reviews.llvm.org/D6425

Files:
  lib/Linker/LinkModules.cpp
  test/Linker/jumptable-a.ll
  test/Linker/jumptable-b.ll
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