rjmccall added inline comments.

================
Comment at: lib/CodeGen/TargetInfo.h:274
+    return LangAS::Default;
+  }
+
----------------
This target hook should just return the address space of the `__cxa_atexit` 
argument, not to claim anything specific about the relation between that 
address space and others.  That is a global and permanent property of the 
target ABI.  We should *advise* targets to use an address space that other 
major address spaces can be bitcast to, but ultimately that's just advisory.

This would be a good thing to include in a PR to the Itanium C++ ABI, but it 
would be reasonable to bundle all the address-space-related changes you need in 
one PR.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D62413/new/

https://reviews.llvm.org/D62413



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