x/tools: drop go1.18 support

Updates golang/go#64407

Change-Id: I247a7ff7f07613674f8e31e4cb9c5a68762d2203
Reviewed-on: https://go-review.googlesource.com/c/tools/+/567418
Reviewed-by: Robert Findley <[email protected]>
Auto-Submit: Alan Donovan <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: adonovan

cmd/bisect/main_test.go

@@ -17,7 +17,6 @@ import (
 	"testing"
 
 	"golang.org/x/tools/internal/bisect"
-	"golang.org/x/tools/internal/compat"
 	"golang.org/x/tools/internal/diffp"
 	"golang.org/x/tools/txtar"
 )
@@ -82,7 +81,7 @@ func Test(t *testing.T) {
 						have[color] = true
 					}
 					if m.ShouldReport(uint64(i)) {
-						out = compat.Appendf(out, "%s %s\n", color, bisect.Marker(uint64(i)))
+						out = fmt.Appendf(out, "%s %s\n", color, bisect.Marker(uint64(i)))
 					}
 				}
 				err = nil

copyright/copyright.go

@@ -2,9 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.18
-// +build go1.18
-
 // Package copyright checks that files have the correct copyright notices.
 package copyright
 

copyright/copyright_test.go

@@ -2,9 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.18
-// +build go1.18
-
 package copyright
 
 import (

go.mod

@@ -1,6 +1,6 @@
 module golang.org/x/tools
 
-go 1.18
+go 1.19
 
 require (
 	github.com/yuin/goldmark v1.4.13

go/analysis/passes/asmdecl/arches_go118.go

@@ -96,6 +96,7 @@ var (
 	asmArchRISCV64  = asmArch{name: "riscv64", bigEndian: false, stack: "SP", lr: true, retRegs: []string{"X10", "F10"}}
 	asmArchS390X    = asmArch{name: "s390x", bigEndian: true, stack: "R15", lr: true}
 	asmArchWasm     = asmArch{name: "wasm", bigEndian: false, stack: "SP", lr: false}
+	asmArchLoong64  = asmArch{name: "loong64", bigEndian: false, stack: "R3", lr: true}
 
 	arches = []*asmArch{
 		&asmArch386,
@@ -111,11 +112,11 @@ var (
 		&asmArchRISCV64,
 		&asmArchS390X,
 		&asmArchWasm,
+		&asmArchLoong64,
 	}
 )
 
 func init() {
-	arches = append(arches, additionalArches()...)
 	for _, arch := range arches {
 		arch.sizes = types.SizesFor("gc", arch.name)
 		if arch.sizes == nil {

go/analysis/passes/asmdecl/arches_go119.go

@@ -4,8 +4,6 @@
 
 // This file contains tests for the useless-assignment checker.
 
-//go:build go1.18
-
 package testdata
 
 import "math/rand"

go/analysis/passes/asmdecl/asmdecl.go

@@ -4,8 +4,6 @@
 
 // This file contains tests for the useless-assignment checker.
 
-//go:build go1.18
-
 package testdata
 
 import "math/rand"

go/analysis/passes/assign/testdata/src/typeparams/typeparams.go

@@ -4,8 +4,6 @@
 
 // This file contains tests for the bool checker.
 
-//go:build go1.18
-
 package typeparams
 
 type T[P interface{ ~int }] struct {