[3.14] gh-142534: Avoid TSan warnings in dictobject.c (gh-142544) #142603
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There are places we use "relaxed" loads where C11 requires "consume" or
stronger. Unfortunately, compilers don't really implement "consume" so
fake it for our use in a way that avoids upsetting TSan.
(cherry picked from commit 0a62f82)
Co-authored-by: Sam Gross [email protected]