Fix assertion failure on LLVM 3.8+

Author: Keno

src/jitlayers.cpp

@@ -544,24 +544,25 @@ static T *addComdat(T *G)
         // Add comdat information to make MSVC link.exe happy
         // it's valid to emit this for ld.exe too,
         // but makes it very slow to link for no benefit
-#if defined(_COMPILER_MICROSOFT_)
         if (G->getParent() == shadow_output) {
+#if defined(_COMPILER_MICROSOFT_)
             Comdat *jl_Comdat = G->getParent()->getOrInsertComdat(G->getName());
             // ELF only supports Comdat::Any
             jl_Comdat->setSelectionKind(Comdat::NoDuplicates);
             G->setComdat(jl_Comdat);
-        }
 #endif
+#if defined(_CPU_X86_64_)
+            // Add unwind exception personalities to functions to handle async exceptions
+            assert(!juliapersonality_func || juliapersonality_func->getParent() == shadow_output);
+            if (Function *F = dyn_cast<Function>(G))
+                F->setPersonalityFn(juliapersonality_func);
+#endif
+        }
         // add __declspec(dllexport) to everything marked for export
         if (G->getLinkage() == GlobalValue::ExternalLinkage)
             G->setDLLStorageClass(GlobalValue::DLLExportStorageClass);
         else
             G->setDLLStorageClass(GlobalValue::DefaultStorageClass);
-#if defined(_CPU_X86_64_)
-        // Add unwind exception personalities to functions to handle async exceptions
-        if (Function *F = dyn_cast<Function>(G))
-            F->setPersonalityFn(juliapersonality_func);
-#endif
     }
 #endif
     return G;