diff --git a/clang/lib/CodeGen/CGDecl.cpp b/clang/lib/CodeGen/CGDecl.cpp
index fc16fb370dbaa..e143687479ee3 100644
--- a/clang/lib/CodeGen/CGDecl.cpp
+++ b/clang/lib/CodeGen/CGDecl.cpp
@@ -2453,7 +2453,10 @@ void CodeGenFunction::EmitParmDecl(const VarDecl &D, ParamValue Arg,
   assert((isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D)) &&
          "Invalid argument to EmitParmDecl");
 
-  Arg.getAnyValue()->setName(D.getName());
+  // Set the name of the parameter's initial value to make IR easier to
+  // read. Don't modify the names of globals.
+  if (!isa<llvm::GlobalValue>(Arg.getAnyValue()))
+    Arg.getAnyValue()->setName(D.getName());
 
   QualType Ty = D.getType();
 
diff --git a/clang/test/CodeGenCXX/inheriting-constructor.cpp b/clang/test/CodeGenCXX/inheriting-constructor.cpp
index b984ea177f211..37e9166becb4f 100644
--- a/clang/test/CodeGenCXX/inheriting-constructor.cpp
+++ b/clang/test/CodeGenCXX/inheriting-constructor.cpp
@@ -4,6 +4,24 @@
 // RUN: %clang_cc1 -no-enable-noundef-analysis -std=c++11 -triple i386-windows -emit-llvm -o - %s | FileCheck %s --check-prefix=MSABI --check-prefix=WIN32
 // RUN: %clang_cc1 -no-enable-noundef-analysis -std=c++11 -triple x86_64-windows -emit-llvm -o - %s | FileCheck %s --check-prefix=MSABI --check-prefix=WIN64
 
+// PR63618: make sure we generate definitions for all the globals defined in the test
+// MSABI: @"?b@@3UB@@A" = {{.*}} zeroinitializer
+// MSABI: @"?d@@3UD@@A" = {{.*}} zeroinitializer
+// MSABI: @"?b@noninline_nonvirt@@3UB@1@A" = {{.*}} zeroinitializer
+// MSABI: @"?c@noninline_nonvirt@@3UC@1@A" = {{.*}} zeroinitializer
+// MSABI: @"?b@noninline_virt@@3UB@1@A" = {{.*}} zeroinitializer
+// MSABI: @"?c@noninline_virt@@3UC@1@A" = {{.*}} zeroinitializer
+// MSABI: @"?b@inalloca_nonvirt@@3UB@1@A" = {{.*}} zeroinitializer
+// MSABI: @"?c@inalloca_nonvirt@@3UC@1@A" = {{.*}} zeroinitializer
+// MSABI: @"?b@inalloca_virt@@3UB@1@A" = {{.*}} zeroinitializer
+// MSABI: @"?c@inalloca_virt@@3UC@1@A" = {{.*}} zeroinitializer
+// MSABI: @"?b@inline_nonvirt@@3UB@1@A" = {{.*}} zeroinitializer
+// MSABI: @"?c@inline_nonvirt@@3UC@1@A" = {{.*}} zeroinitializer
+// MSABI: @"?b@inline_virt@@3UB@1@A" = {{.*}} zeroinitializer
+// MSABI: @"?c@inline_virt@@3UC@1@A" = {{.*}} zeroinitializer
+
+// MSABI-NOT: @this
+
 // PR12219
 struct A { A(int); virtual ~A(); };
 struct B : A { using A::A; ~B(); };