Use TrustedRandomAccess for loop desugaring#93243

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the8472 wants to merge 13 commits intorust-lang:masterfrom

the8472:tra-for-in2

Commits on Apr 19, 2022

Commits on Apr 20, 2022

Use marker/specialization traits instead of associated consts to signal the need for pre/post loop calls
the8472
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use separate methods for forward and backward cleanup
the8472
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