Merge pull request #7899 from ziqingluo-90/stable/20230725

[-Wunsafe-buffer-usage] Add a subgroup `-Wunsafe-buffer-usage-in-container`

Author: ziqingluo-90

clang/include/clang/Basic/DiagnosticGroups.td

@@ -1453,4 +1453,5 @@ def DXILValidation : DiagGroup<"dxil-validation">;
 def ReadOnlyPlacementChecks : DiagGroup<"read-only-types">;
 
 // Warnings and fixes to support the "safe buffers" programming model.
-def UnsafeBufferUsage : DiagGroup<"unsafe-buffer-usage">;
+def UnsafeBufferUsageInContainer : DiagGroup<"unsafe-buffer-usage-in-container">;
+def UnsafeBufferUsage : DiagGroup<"unsafe-buffer-usage", [UnsafeBufferUsageInContainer]>;