targets: thumbv8m: Add target for baseline ARMv8-M#55041

Merged

bors merged 3 commits intorust-lang:masterfrom evq:thumbv8m

Dec 4, 2018

+40-2

Commits on Oct 13, 2018

Commits on Oct 19, 2018

rename to thumbv8m.base-none-eabi, fix strict alignment
evq
committed