cmd/compile: keep call's args in elim dead auto pass

If the address of an auto is used in a Call, we need to keep it,
as we keep the Call itself.

Fixes #45693.

Change-Id: Ie548d6dffc95bf916868a8885d4ab4cf9e86355a
Reviewed-on: https://go-review.googlesource.com/c/go/+/312670
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/test/fixedbugs/issue45693.go b/test/fixedbugs/issue45693.go
new file mode 100644
index 0000000000..20a0cec8ff
--- /dev/null
+++ b/test/fixedbugs/issue45693.go
@@ -0,0 +1,16 @@
+// 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.
+
+// Issue 45693: ICE with register args.
+
+package p
+
+func f() {
+	var s string
+	s = s + "" + s + "" + s + ""
+	for {
+	}
+}