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Add `Vec::remove_insert()` #1455

Job	Run time
testmiri	1m 31s
clippy	21s
style	14s
doc	36s
test	23s
testcfail	25s
check (armv7r-none-eabi)	36s
testtsan (x86_64-unknown-linux-gnu, --release)	54s
check (x86_64-unknown-linux-gnu)	33s
testtsan (x86_64-unknown-linux-gnu)	47s
testcpass (x86_64-unknown-linux-gnu)	18s
testcpass (x86_64-unknown-linux-gnu, --release)	20s
check (riscv32imc-unknown-none-elf)	34s
testcpass (i686-unknown-linux-musl, --release)	20s
testcpass (i686-unknown-linux-musl)	22s
check (thumbv8m.base-none-eabi)	34s
check (thumbv6m-none-eabi)	34s
check (thumbv8m.main-none-eabi)	38s
check (i686-unknown-linux-musl)	38s
check (thumbv7m-none-eabi)	35s
	11m 13s

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