[flang-commits] [flang] [flang][runtime] Fix integer overflow check in FORMAT (PR #79368)

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vdonaldson wrote:

Compare [format.h lines 206-236](https://github.com/llvm/llvm-project/blob/main/flang/include/flang/Common/format.h#L206). Would that code work here? Does that code also need to be changed?

https://github.com/llvm/llvm-project/pull/79368