Merge pull request #307 from rust-embedded/rvrt-asm #332

Job	Run time
run-trybuild (ubuntu-latest)	33s
run-trybuild (macos-latest)	27s
run-build (stable, riscv32im-unknown-none-elf, empty)	23s
run-build (stable, riscv64imac-unknown-none-elf, empty)	23s
run-build (stable, riscv32imac-unknown-none-elf, empty)	24s
run-build (stable, riscv32i-unknown-none-elf, empty)	23s
run-build (stable, riscv64gc-unknown-none-elf, empty)	16s
run-build (stable, riscv32imc-unknown-none-elf, empty)	26s
run-build (stable, riscv32imafc-unknown-none-elf, empty)	23s
run-build (1.67.0, riscv32i-unknown-none-elf, empty)	1m 47s
run-build (nightly, riscv32imac-unknown-none-elf, empty)	22s
run-build (nightly, riscv32imc-unknown-none-elf, empty)	21s
run-build (nightly, riscv64imac-unknown-none-elf, empty)	26s
run-build (nightly, riscv32imafc-unknown-none-elf, empty)	25s
run-build (1.67.0, riscv32imac-unknown-none-elf, empty)	1m 46s
run-build (nightly, riscv32i-unknown-none-elf, empty)	22s
run-build (1.67.0, riscv32imc-unknown-none-elf, empty)	1m 54s
run-build (nightly, riscv32im-unknown-none-elf, empty)	24s
run-build (1.67.0, riscv64gc-unknown-none-elf, empty)	1m 48s
run-build (nightly, riscv64gc-unknown-none-elf, empty)	31s
run-build (1.67.0, riscv64imac-unknown-none-elf, empty)	1m 46s
tests-check	5s
	15m 35s

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