Build

Backport SPSC fixes to 0.7 branch #1512

Job	Run time
style	14s
test	11s
testmiri	35s
testcpass (i686-unknown-linux-musl)	18s
doc (thumbv7m-none-eabi)	23s
doc (x86_64-unknown-linux-gnu)	19s
testcfail	12s
testcpass (x86_64-unknown-linux-gnu, --release)	9s
testtsan (x86_64-unknown-linux-gnu)	37s
testcpass (x86_64-unknown-linux-gnu)	13s
testtsan (x86_64-unknown-linux-gnu, --release)	43s
testcpass (i686-unknown-linux-musl, --release)	14s
check (x86_64-unknown-linux-gnu)	12s
check (thumbv7m-none-eabi)	8s
check (thumbv8m.base-none-eabi)	7s
check (i686-unknown-linux-musl)	8s
check (thumbv6m-none-eabi)	18s
check (armv7r-none-eabi)	10s
check (thumbv8m.main-none-eabi)	8s
check (riscv32imc-unknown-none-elf)	4s
	5m 23s

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