[CStringSyntaxChecker] Check strlcpy sizeof syntax
The last argument is expected to be the destination buffer size (or less). Detects if it points to destination buffer size directly or via a variable. Detects if it is an integral, try to detect if the destination buffer can receive the source length. Updating bsd-string.c unit tests as it make it fails now. Reviewers: george.karpenpov, NoQ Reviewed By: george.karpenkov Differential Revision: https://reviews.llvm.org/D48884 llvm-svn: 337499
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