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made gdb pretty-printing script more robust when printing uninitializ…
…ed vec. I based this solution on my reading of: https://rethinkdb.com/blog/make-debugging-easier-with-custom-pretty-printers#what-is-still-to-be-done That post claims that there is no clean way to check for garbage pointers, and so this PR adopts the same solution of tentatively attempting to convert a dererence to a string, which throws a clean exception on garbage that we can catch and recover from. I only made the change to vec and not the other pretty printers because I wanted to focus my effort on the simplest thing that would resolve issue #64343. In particular, I *considered* generalizing this fix to work on the other datatypes in the pretty-printing support library, but I don't want to invest effort in that until after we resolve our overall debugging support strategy; see also issues #60826 and #65564.
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