cmd/compile: allow ir.OSLICE2ARRPTR in mayCall

CL 301650 adds conversion from slice to array ptr. The conversion
expression may appear as argument to a function call, so it will be
tested by mayCall. But ir.OSLICE2ARRPTR  op is not handled by mayCall,
causes the compiler crashes.

Updates #395
Fixes #46720

Change-Id: I39e1b3e38e224a31f3dec46dbbdc855ff3b2c6a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/327649
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/test/fixedbugs/issue46720.go b/test/fixedbugs/issue46720.go
new file mode 100644
index 0000000000..3b0151ae84
--- /dev/null
+++ b/test/fixedbugs/issue46720.go
@@ -0,0 +1,15 @@
+// compile
+
+// 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 p
+
+func f() {
+	nonce := make([]byte, 24)
+	g((*[24]byte)(nonce))
+}
+
+//go:noinline
+func g(*[24]byte) {}