Merge List:
+ 2021-02-18
eb982727e3 cmd/go/internal/mvs: fix Downgrade to match Algorithm 4
+ 2021-02-18
3b7277d365 cmd/go: add a script test for artifacts resulting from 'go get -u'
+ 2021-02-18
f3c2208e2c cmd/go: add script tests for potential upgrades due to downgrades
+ 2021-02-18
a5c8a15f64 cmd/go/internal/mvs: clarify and annotate test cases
+ 2021-02-18
a76efea1fe cmd/go/internal/mvs: don't emit duplicates from Req
+ 2021-02-18
609d82b289 cmd/dist: set GOARM=7 for windows/arm
+ 2021-02-18
f0be3cc547 runtime: unbreak linux/riscv64 following regabi merge
+ 2021-02-18
07ef313525 runtime/cgo: add cast in C code to avoid C compiler warning
Change-Id: I8e58ad1e82a9ea313a99c1b11df5b341f80680d4