[clang] [-Wunsafe-buffer-usage] Add a subgroup `-Wunsafe-buffer-usage-in-container` (PR #75665)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Ziqing Luo (ziqingluo-90)

<details>
<summary>Changes</summary>

Add a sub diagnostic group under `-Wunsafe-buffer-usage` controlled by `-Wunsafe-buffer-usage-in-container`.  The subgroup will include warnings on misuses of `std::span`, `std::vector`, and `std::array`.

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Full diff: https://github.com/llvm/llvm-project/pull/75665.diff


1 Files Affected:

- (modified) clang/include/clang/Basic/DiagnosticGroups.td (+2-1) 


``````````diff
diff --git a/clang/include/clang/Basic/DiagnosticGroups.td b/clang/include/clang/Basic/DiagnosticGroups.td
index 80b5680b94f6ca..7cf347e92d9972 100644
--- a/clang/include/clang/Basic/DiagnosticGroups.td
+++ b/clang/include/clang/Basic/DiagnosticGroups.td
@@ -1488,4 +1488,5 @@ 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]>;

``````````

</details>


https://github.com/llvm/llvm-project/pull/75665