[dev.boringcrypto] all: merge master into dev.boringcrypto

[dev.boringcrypto] all: merge master into dev.boringcrypto

Conflicts due to crypto/internal/cipherhw removal:
	src/crypto/aes/cipher_amd64.go
	src/crypto/internal/cipherhw/cipherhw_amd64.go
	src/go/build/deps_test.go

This removes the AESGCMSupport patch, as there is no equivalent place
for it. The logic will be added back in the next change.

Change-Id: I8169069ff732b6cd0b56279c073cf5e0dd36959d