rjmccall added inline comments.

================
Comment at: lib/Sema/SemaExpr.cpp:6522
+    bool HasDifferingLAddrSpace = LAddrSpace != ResultAddrSpace;
+    bool HasDifferingRAddrSpace = RAddrSpace != ResultAddrSpace;
+
----------------
I was going to tell you to use the predicate 
`Qualifiers::isAddressSpaceSupersetOf` here, but then I was looking at the uses 
of that, and I think the real fix is to just go into the implementation of 
`checkConditionalPointerCompatibility` and make the compatibility logic not 
OpenCL-specific.  The fast-path should just be whether the address spaces are 
different.

And it looks like this function has a bug where it always uses 
`LangAS::Default` outside of OpenCL even if the pointers are in the same 
address space.


Repository:
  rC Clang

https://reviews.llvm.org/D50278



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