[clang] [Wunsafe-buffer-usage] Address some false positives in handling array indices that are decidably correct (PR #117370)

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@@ -463,6 +471,13 @@ AST_MATCHER(ArraySubscriptExpr, isSafeArraySubscript) {
       return true;
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mxms0 wrote:

I changed the code and tests still pass, it looks like you're correct. :)

https://github.com/llvm/llvm-project/pull/117370