cmd/link: remove special cases for Method() and MethodByName().
There is no more need to do this in the linker. The compiler now
handles both Type.Method() and Value.Method(), and flags their
users as ReflectMethod.
Change-Id: Ice93d5d975a1b93a324471e8abdebdce141d17d0
Reviewed-on: https://go-review.googlesource.com/c/go/+/522437
Run-TryBot: Cherry Mui <cherryyz@google.com> Reviewed-by: Joedian Reid <joedian@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Cherry Mui <cherryyz@google.com>