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Auto merge of #151337 - the8472:bail-before-memcpy2, r=Mark-Simulacrum
optimize `vec.extend(slice.to_vec())`, take 2
Redoing https://github.com/rust-lang/rust/pull/130998
It was reverted in https://github.com/rust-lang/rust/pull/151150 due to flakiness. I have traced this to layout randomization perturbing the test (the failure reproduces locally with layout randomization), which is now excluded.
