Merge #372

372: asm/inline: explicitly use asm macro r=adamgreig a=jordens

`asm!()` removed from prelude in current nightly
rust-lang/rust#91728

close #371

This is also a good candidate for the cortex-m v0.7 series.

Co-authored-by: Robert Jördens <rj@quartiq.de>
Co-authored-by: Adam Greig <adam@adamgreig.com>

Author: 3 people

asm-toolchain

@@ -1 +1 @@
-nightly-2020-08-26
+nightly-2021-12-16