cmd/compile: use generated temps in bool codegen

Bool codegen was generating a temp for function calls
and other complex expressions, but was not using it.

This was a refactoring bug introduced by CL 7853.
The cmp code used to do (in short):

	l, r := &n1, &n2

It was changed to:

	l, r := nl, nr

But the requisite assignments:

	nl, nr = &n1, &n2

were only introduced on one of two code paths.

Fixes #10654.

Change-Id: Ie8de0b3a333842a048d4308e02911bb10c6915ce
Reviewed-on: https://go-review.googlesource.com/10844
Reviewed-by: Minux Ma <minux@golang.org>
Run-TryBot: Minux Ma <minux@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/test/fixedbugs/issue10654.go b/test/fixedbugs/issue10654.go
new file mode 100644
index 0000000..0600a80
--- /dev/null
+++ b/test/fixedbugs/issue10654.go
@@ -0,0 +1,17 @@
+// compile
+
+// Copyright 2015 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 10654: Failure to use generated temps
+// for function calls etc. in boolean codegen.
+
+package main
+
+var s string
+
+func main() {
+	if (s == "this") != (s == "that") {
+	}
+}