DO NOT SUBMIT: Demonstrate that new msan CI jobs work#467

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briansmith wants to merge 3 commits intorust-random:masterfrom

briansmith:b/msan-fail

Commits on Jun 6, 2024

Test `getrandom_uninit()` with initially-uninitialized buffer.
briansmith
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Commits on Jun 7, 2024

Support msan; Android/Linux: unpoison output of getrandom syscall.
briansmith
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DO NOT MERGE: Force MSAN tests to fail to show it's working.
briansmith
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