Follow-up to r281367: Compare uuids case-insensitively.

llvm-svn: 281430
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index c23db57..a0c0e81 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -4607,7 +4607,7 @@
 UuidAttr *Sema::mergeUuidAttr(Decl *D, SourceRange Range,
                               unsigned AttrSpellingListIndex, StringRef Uuid) {
   if (const auto *UA = D->getAttr<UuidAttr>()) {
-    if (UA->getGuid() == Uuid)
+    if (UA->getGuid().equals_lower(Uuid))
       return nullptr;
     Diag(UA->getLocation(), diag::err_mismatched_uuid);
     Diag(Range.getBegin(), diag::note_previous_uuid);
diff --git a/clang/test/SemaCXX/ms-uuid.cpp b/clang/test/SemaCXX/ms-uuid.cpp
index 2192f67..461e3c1 100644
--- a/clang/test/SemaCXX/ms-uuid.cpp
+++ b/clang/test/SemaCXX/ms-uuid.cpp
@@ -29,7 +29,8 @@
 
 // Both cl and clang-cl accept this:
 class __declspec(uuid("000000A0-0000-0000-C000-000000000049")) C1;
-class __declspec(uuid("000000A0-0000-0000-C000-000000000049")) C1;
+class __declspec(uuid("000000a0-0000-0000-c000-000000000049")) C1;
+class __declspec(uuid("{000000a0-0000-0000-C000-000000000049}")) C1;
 class __declspec(uuid("000000A0-0000-0000-C000-000000000049")) C1 {};
 
 // Both cl and clang-cl error out on this: