cmd/compile/internal/typecheck: remove some un-used functions

cmd/compile/internal/typecheck: remove some un-used functions

CL 405094 removed the only caller of markBreak/setHasBreak and
isTermNodes/isTermNode.

importlist variable is only used in old frontend.

Change-Id: I9472f2c0017b6200847999f2cea0e9021a1b14e2
Reviewed-on: https://go-review.googlesource.com/c/go/+/484435
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>