cmd/compile: align formal parameters with actual argument when reporting incorrect number of arguments

[tumdum]

What version of Go are you using (go version)?

$ go version
go version go1.13 linux/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/klak/.cache/go-build"
GOENV="/home/klak/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/klak"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build664638301=/tmp/go-build -gno-record-gcc-switches"

What did you do?

https://play.golang.org/p/Jgg2p681cOG

What did you expect to see?

./prog.go:7:5: not enough arguments in call to foo
	have (number, number, number, number)
	want (int,    int,    int,    int, int, int)

What did you see instead?

./prog.go:7:5: not enough arguments in call to foo
	have (number, number, number, number)
	want (int, int, int, int, int, int)

[ianlancetaylor]

CC @griesemer @mdempsky

[griesemer]

There may be better ways to report this error, but aligning the output will only cause more problems (one can easily imagine overlong lines that are harder to decipher than what's here now).

Not urgent.