Fix an unsigned integer overflow in regex that lead to a bad memory access. Found by OSS-Fuzz
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@316191 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@316191 91177308-0d34-0410-b5e6-96231b3b80d8
mentioned in commit e0ca3648