[dev.link] all: merge branch 'master' into dev.link

Change-Id: I85b653b621ad8cb2ef27886210ea2c4b7409b60d

diff --cc src/cmd/internal/obj/objfile.go
Simple merge

diff --cc src/cmd/link/internal/arm/asm.go
Simple merge

diff --cc src/cmd/link/internal/ld/pcln.go
Simple merge

diff --cc src/cmd/link/internal/loader/loader.go
Simple merge

diff --cc src/cmd/link/internal/ppc64/asm.go
Simple merge

diff --cc src/cmd/link/link_test.go
Simple merge