cmd/compile: desugar OCALLMETH->OCALLFUNC within devirtualization

Devirtualization can turn OCALLINTER into OCALLMETH, but then we want
to actually desugar into OCALLFUNC instead for later phases. Just
needs a missing call to typecheck.FixMethodCall.

Fixes #57309.

Change-Id: I331fbd40804e1a370134ef17fa6dd501c0920ed3
Reviewed-on: https://go-review.googlesource.com/c/go/+/457715
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

src/cmd/compile/internal/devirtualize/devirtualize.go

@@ -152,4 +152,7 @@ func Call(call *ir.CallExpr) {
 	default:
 		call.SetType(ft.Results())
 	}
+
+	// Desugar OCALLMETH, if we created one (#57309).
+	typecheck.FixMethodCall(call)
 }

test/fixedbugs/issue57309.go

@@ -0,0 +1,23 @@
+// run
+
+// Copyright 2022 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
+
+type I interface {
+	M()
+}
+
+type S struct {
+}
+
+func (*S) M() {
+}
+
+func main() {
+	func() {
+		I(&S{}).M()
+	}()
+}