Index: lib/AST/Decl.cpp
===================================================================
--- lib/AST/Decl.cpp
+++ lib/AST/Decl.cpp
@@ -666,7 +666,12 @@
       // Use global type/value visibility as appropriate.
       Visibility globalVisibility;
       if (computation == LVForValue) {
-        globalVisibility = Context.getLangOpts().getValueVisibilityMode();
+        const FunctionDecl *FD = D->getAsFunction();
+        if (FD && FD->getCorrespondingUnsizedGlobalDeallocationFunction())
+          // C++14's implicit sized deallocation functions always have default visibility.
+          globalVisibility = DefaultVisibility;
+        else
+          globalVisibility = Context.getLangOpts().getValueVisibilityMode();
       } else {
         assert(computation == LVForType);
         globalVisibility = Context.getLangOpts().getTypeVisibilityMode();
Index: test/CodeGenCXX/cxx14-implicit-sized-delete.cpp
===================================================================
--- /dev/null
+++ test/CodeGenCXX/cxx14-implicit-sized-delete.cpp
@@ -0,0 +1,27 @@
+// RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple -o - -std=c++14 %s 2>&1 | FileCheck %s -check-prefix=CHECKDEF -check-prefix=CHECK
+// RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple -o - -std=c++14 -fvisibility hidden %s 2>&1 | FileCheck %s -check-prefix=CHECKHID -check-prefix=CHECK
+
+// PR22419: Implicit sized deallocation functions always have default visibility.
+
+// CHECKDEF-DAG: define void @_Z3fooPi(i32* %is)
+// CHECKHID-DAG: define hidden void @_Z3fooPi(i32* %is)
+void foo(int* is) {
+  
+  // CHECK-DAG: call void @_ZdlPvm(i8* %1, i64 4)
+  delete is;
+}
+
+// CHECK-DAG: define linkonce void @_ZdlPvm(i8*, i64)
+
+// CHECK-DAG: %struct.A = type { i8 }
+struct A { ~A() { }};
+
+// CHECKDEF-DAG: define void @_Z1fP1A(%struct.A* %p)
+// CHECKHID-DAG: define hidden void @_Z1fP1A(%struct.A* %p)
+void f(A *p) {
+  
+  // CHECK-DAG: call void @_ZdaPvm(i8* %2, i64 %6)
+  delete[] p;
+}
+
+// CHECK-DAG: define linkonce void @_ZdaPvm(i8*, i64)
\ No newline at end of file