Index: clang/include/clang/Basic/Linkage.h
===================================================================
--- clang/include/clang/Basic/Linkage.h
+++ clang/include/clang/Basic/Linkage.h
@@ -69,6 +69,10 @@
   GVA_StrongODR
 };
 
+inline bool isDiscardableGVALinkage(GVALinkage L) {
+  return L <= GVA_DiscardableODR;
+}
+
 inline bool isExternallyVisible(Linkage L) {
   return L == ExternalLinkage || L == VisibleNoLinkage;
 }
Index: clang/include/clang/Sema/Sema.h
===================================================================
--- clang/include/clang/Sema/Sema.h
+++ clang/include/clang/Sema/Sema.h
@@ -9241,7 +9241,7 @@
   /// discover that a function is known-emitted, we remove it and everything it
   /// transitively calls from this set and add those functions to
   /// CUDAKnownEmittedFns.
-  llvm::DenseMap<FunctionDecl *, llvm::DenseSet<FunctionDecl *>> CUDACallGraph;
+  llvm::DenseMap<FunctionDecl *, llvm::SetVector<FunctionDecl *>> CUDACallGraph;
 
   /// Diagnostic builder for CUDA errors which may or may not be deferred.
   ///
Index: clang/lib/AST/ASTContext.cpp
===================================================================
--- clang/lib/AST/ASTContext.cpp
+++ clang/lib/AST/ASTContext.cpp
@@ -8802,15 +8802,10 @@
       }
     }
 
-    GVALinkage Linkage = GetGVALinkageForFunction(FD);
-
     // static, static inline, always_inline, and extern inline functions can
     // always be deferred.  Normal inline functions can be deferred in C99/C++.
     // Implicit template instantiations can also be deferred in C++.
-    if (Linkage == GVA_Internal || Linkage == GVA_AvailableExternally ||
-        Linkage == GVA_DiscardableODR)
-      return false;
-    return true;
+    return !isDiscardableGVALinkage(GetGVALinkageForFunction(FD));
   }
   
   const VarDecl *VD = cast<VarDecl>(D);
@@ -8821,9 +8816,7 @@
     return false;
 
   // Variables that can be needed in other TUs are required.
-  GVALinkage L = GetGVALinkageForVariable(VD);
-  if (L != GVA_Internal && L != GVA_AvailableExternally &&
-      L != GVA_DiscardableODR)
+  if (!isDiscardableGVALinkage(GetGVALinkageForVariable(VD)))
     return true;
 
   // Variables that have destruction with side-effects are required.
Index: clang/lib/Sema/SemaCUDA.cpp
===================================================================
--- clang/lib/Sema/SemaCUDA.cpp
+++ clang/lib/Sema/SemaCUDA.cpp
@@ -543,7 +543,7 @@
     return false;
 
   // Externally-visible and similar functions are always emitted.
-  if (S.getASTContext().GetGVALinkageForFunction(FD) > GVA_DiscardableODR)
+  if (!isDiscardableGVALinkage(S.getASTContext().GetGVALinkageForFunction(FD)))
     return true;
 
   // Otherwise, the function is known-emitted if it's in our set of