Commits on Nov 20, 2019

1. 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 rust-lang#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 rust-lang#60826 and rust-lang#65564.

   

   pnkfelix committed Nov 20, 2019
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