Tanmay deca8055d4 Avoid nullptr+0 in Regex (#73071) ...

A zero-length StringRef can have a null data pointer, which, if passed to the llvm_regex functions which take a pointer+length, but then convert it into a [begin, end) pointer pair can cause a nullptr+0 expression to be evaluated, which is UB. So avoid that by ensuring the data pointer is always non-null, even in the zero-length case.

2023-12-01 11:28:42 -08:00

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