Eli Friedman d751f86189 [ConstantFold] Make areGlobalsPotentiallyEqual less aggressive. ...

In particular, we shouldn't make assumptions about globals which are
unnamed_addr: we can fold them together with other globals.

Also while I'm here, use isInterposable() instead of trying to
explicitly name all the different kinds of weak linkage.

Fixes https://bugs.llvm.org/show_bug.cgi?id=47090

Differential Revision: https://reviews.llvm.org/D87123

2020-09-11 17:23:08 -07:00

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