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Fix Darwin 'constinit thread_local' variables.

Authored by jyknight on May 27 2020, 6:55 AM.

Description

Fix Darwin 'constinit thread_local' variables.

Unlike other platforms using ItaniumCXXABI, Darwin does not allow the
creation of a thread-wrapper function for a variable in the TU of
users. Because of this, it can set the linkage of the thread-local
symbol to internal, with the assumption that no TUs other than the one
defining the variable will need it.

However, constinit thread_local variables do not require the use of
the thread-wrapper call, so users reference the variable
directly. Thus, it must not be converted to internal, or users will
get a link failure.

This was a regression introduced by the optimization in
00223827a952f66e7426c9881a2a4229e59bb019.

Differential Revision: https://reviews.llvm.org/D80417