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build: Add MemorySanitizer (MSan) in Travis to detect use of uninitialized memory

Placeholder practicalswift (Thomas J) requested to merge github/fork/practicalswift/msan-in-travis into master

Add MemorySanitizer (MSan) in Travis to detect use of uninitialized memory.

First UBSan, then ASan followed by TSan... and now: yes, the wait is over -- MSan is finally here! :)

Some historical context:

  • 2017: Continuous compilation with Clang Thread Safety analysis enabled (#10866, #10923)
  • 2018: Continuous testing with trapping on signed integer overflows (-ftrapv) (#12686)
  • 2018: Continuous testing of use of locale dependent functions (#13041)
  • 2018: Continuous testing of format strings (#13705)
  • 2018: Continuous compilation with MSVC TreatWarningAsError (#14151)
  • 2018: Continuous testing under UndefinedBehaviorSanitizer – UBSan (#14252, #14673, #17006)
  • 2018: Continuous testing under AddressSanitizer – ASan (#14794, #17205, #17674)
  • 2018: Continuous testing under ThreadSanitizer – TSan (#14829)
  • 2019: Continuous testing in an unsigned char environment (-funsigned-char) (#15134)
  • 2019: Continuous compile-time testing of assumptions we're making (#15391)
  • 2019: Continuous testing of fuzz test cases under Valgrind (#17633, #18159, #18166)
  • 2020: Finally... MemorySanitizer – MSAN! :)

What is the next step? What tools should we add to CI to keep bugs from entering master? :)

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