cmd/compile: allow inlining of ORANGE

Updates #14768

Change-Id: I33831f616eae5eeb099033e2b9cf90fa70d6ca86
Reviewed-on: https://go-review.googlesource.com/c/go/+/356869
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
Trust: Dan Scales <danscales@google.com>
Trust: Alberto Donizetti <alb.donizetti@gmail.com>

src/cmd/compile/internal/inline/inl.go

@@ -358,8 +358,7 @@ func (v *hairyVisitor) doNode(n ir.Node) bool {
 			return true
 		}
 
-	case ir.ORANGE,
-		ir.OSELECT,
+	case ir.OSELECT,
 		ir.OGO,
 		ir.ODEFER,
 		ir.ODCLTYPE, // can't print yet

test/fixedbugs/issue49100b.go

@@ -0,0 +1,27 @@
+// run
+
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+func r(j int) {
+loop:
+	for i, c := range "goclang" {
+		if i == 2 {
+			continue loop
+		}
+		println(string(c))
+	}
+}
+
+func main() {
+loop:
+	for j := 0; j < 4; j++ {
+		r(j)
+		if j == 0 {
+			break loop
+		}
+	}
+}

test/fixedbugs/issue49100b.out

@@ -0,0 +1,6 @@
+g
+o
+l
+a
+n
+g

test/inline.go

@@ -160,6 +160,19 @@ func switchType(x interface{}) int { // ERROR "can inline switchType" "x does no
 	}
 }
 
+func inlineRangeIntoMe(data []int) { // ERROR "can inline inlineRangeIntoMe" "data does not escape"
+	rangeFunc(data, 12) // ERROR "inlining call to rangeFunc"
+}
+
+func rangeFunc(xs []int, b int) int { // ERROR "can inline rangeFunc" "xs does not escape"
+	for i, x := range xs {
+		if x == b {
+			return i
+		}
+	}
+	return -1
+}
+
 type T struct{}
 
 func (T) meth(int, int) {} // ERROR "can inline T.meth"

test/linkname.dir/linkname1.go

@@ -1,6 +1,6 @@
 package x
 
-func indexByte(xs []byte, b byte) int { // ERROR "xs does not escape"
+func indexByte(xs []byte, b byte) int { // ERROR "xs does not escape" "can inline indexByte"
 	for i, x := range xs {
 		if x == b {
 			return i