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Auto merge of #116047 - a-lafrance:I80836-codegen-test, r=Mark-Simulacrum
Add codegen test to guard against VecDeque optimization regression
Very small PR that adds a codegen test to guard against regression for the `VecDeque` optimization addressed in #80836. Ensures that Rustc optimizes away the panic when unwrapping the result of `.get(0)` because of the `!is_empty()` condition.
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