t-tye added inline comments.

================
Comment at: include/clang/AST/ASTContext.h:2319
     return AddrSpaceMapMangling || 
-           AS < LangAS::Offset || 
-           AS >= LangAS::Offset + LangAS::Count;
+           AS > LangAS::target_first;
   }
----------------
Should this be >= since it wants to return for all target address spaces, and 
target_first is the first one?


================
Comment at: include/clang/AST/Type.h:336-342
+  /// Get the address space value used in diagnostics.
+  unsigned getAddressSpacePrintValue() const {
+    unsigned AS = getAddressSpace();
+    if (AS >= LangAS::target_first)
+      return AS - LangAS::target_first;
+    return AS;
+  }
----------------
Is this the right thing to do? This is making the CLANG named address spaces 
have the same numbers as the target-specific address space numbers which would 
seem rather confusing.

What do the diagnostics want to display? For example, they could display the 
address space as a human readable form such as "Default", "OpenCL-global", 
CUDA-device", "target-specific(5)", etc. To do that this function could take an 
iostream and a LangAS value and use << to write to the iostream.


https://reviews.llvm.org/D31404



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