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Fix unwind vulnerability #1526

Job	Run time
testcfail	22s
clippy	17s
style	13s
test	34s
testmiri	1m 44s
doc	20s
testcpass (i686-unknown-linux-musl, --release)	19s
testcpass (x86_64-unknown-linux-gnu, --release)	19s
check (riscv32imc-unknown-none-elf)	37s
check (x86_64-unknown-linux-gnu)	36s
testtsan (x86_64-unknown-linux-gnu)	35s
testtsan (x86_64-unknown-linux-gnu, --release)	42s
testcpass (i686-unknown-linux-musl)	19s
check (thumbv6m-none-eabi)	33s
testcpass (x86_64-unknown-linux-gnu)	17s
check (i686-unknown-linux-musl)	34s
check (armv7r-none-eabi)	39s
check (thumbv8m.main-none-eabi)	36s
check (thumbv7m-none-eabi)	36s
check (thumbv8m.base-none-eabi)	35s
	10m 47s

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