Auto merge of #44999 - pnkfelix:mir-borrowck-fix-assert-left-right, r=nikomatsakis
Overlapping borrows can point to different lvalues. Overlapping borrows can point to different lvalues. There's always a basis for the overlap, so instead of removing the assert entirely, I instead pass in the prefix that we found and check that it actually is a prefix of both lvalues. Fix #44829
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