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LinearMap: add LinearMapView, similar to VecView on top of #486 #831

Job	Run time
style	17s
test	24s
check (x86_64-unknown-linux-gnu)	16s
clippy	14s
check (i686-unknown-linux-musl)	19s
testmiri	1m 13s
check (riscv32imc-unknown-none-elf)	24s
check (armv7r-none-eabi)	33s
doc (x86_64-unknown-linux-gnu)	24s
check (thumbv6m-none-eabi)	22s
testcfail	24s
doc (thumbv7m-none-eabi)	20s
check (thumbv7m-none-eabi)	24s
check (thumbv8m.base-none-eabi)	17s
testcpass (x86_64-unknown-linux-gnu)	16s
testtsan (x86_64-unknown-linux-gnu)	32s
check (thumbv8m.main-none-eabi)	16s
testcpass (x86_64-unknown-linux-gnu, --release)	7s
testtsan (x86_64-unknown-linux-gnu, --release)	44s
testcpass (i686-unknown-linux-musl)	13s
testcpass (i686-unknown-linux-musl, --release)	24s
	8m 23s

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