David Majnemer bb525f7c20 CodeGen: Don't drop thread_local when emitting __thread aliases ...

CodeGen wouldn't mark the aliasee as thread_local if the aliasee was a
tentative definition.

Even if the definition was already emitted, it would never mark the
alias as thread_local.

This fixes PR21288.

llvm-svn: 219859

2014-10-15 22:38:23 +00:00

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