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Auto merge of #141485 - dianqk:early_otherwise_branch_loop, r=oli-obk
mir-opt: Do not create storage marks in EarlyOtherwiseBranch
Fixes #141212.
The first commit add `StorageDead` by creating new indirect BB that makes CFG more complicated, but I think it's better to just not create storage marks.
r? mir-opt
