cmd/compile: reflect.Type does not implement comparable

[limpo1989]

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

$ go version
go version go1.18.2 windows/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
et GO111MODULE=on
set GOARCH=amd64
set GOBIN=      
set GOCACHE=C:\Users\Administrator\AppData\Local\go-build
set GOENV=C:\Users\Administrator\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=D:\gomod\pkg\mod
set GONOPROXY=***
set GONOSUMDB=***
set GOOS=windows
set GOPATH=D:\gomod;C:\Users\Administrator\go
set GOPRIVATE=git.idianhun.com,git.dianhun.cn
set GOPROXY=https://goproxy.io,direct
set GOROOT=D:\Go
set GOSUMDB=off
set GOTMPDIR=
set GOTOOLDIR=D:\Go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.18.2
set GCCGO=gccgo
set GOAMD64=v1
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=*********\example\go.mod
set GOWORK=
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=C:\Users\ADMINI~1\AppData\Local\Temp\go-build1029863356=/tmp/go-build -gno-record-gcc-switches

What did you do?

https://go.dev/play/p/wSisCGgWwUg

// You can edit this code!
// Click here and start typing.
package main

import (
	"fmt"
	"reflect"

	"golang.org/x/exp/maps"
)

func main() {
	var types = make(map[reflect.Type]int)
	fmt.Println(maps.Keys(types))
}

What did you expect to see?

compiled successfully

What did you see instead?

./prog.go:14:23: reflect.Type does not implement comparable

Go build failed.

[seankhliao]

Duplicate of #52509 and others