go/types,types2: move notinheap tests to fixedbugs directory

So they can be added to ignored list, since the tests now require
cgo.Incomplete, which is not recognized by go/types and types2.

Updates #46731

Change-Id: I9f24e3c8605424d1f5f42ae4409437198f4c1326
Reviewed-on: https://go-review.googlesource.com/c/go/+/427142
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>

test/fixedbugs/notinheap2.go

@@ -0,0 +1,85 @@
+// errorcheck -+
+
+// Copyright 2016 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.
+
+// Test walk errors for not-in-heap.
+
+//go:build cgo
+
+package p
+
+import "runtime/cgo"
+
+type nih struct {
+	_    cgo.Incomplete
+	next *nih
+}
+
+// Global variables are okay.
+
+var x nih
+
+// Stack variables are not okay.
+
+func f() {
+	var y nih // ERROR "nih is incomplete \(or unallocatable\); stack allocation disallowed"
+	x = y
+}
+
+// Heap allocation is not okay.
+
+var y *nih
+var y2 *struct{ x nih }
+var y3 *[1]nih
+var z []nih
+var w []nih
+var n int
+var sink interface{}
+
+type embed1 struct { // implicitly notinheap
+	x nih
+}
+
+type embed2 [1]nih // implicitly notinheap
+
+type embed3 struct { // implicitly notinheap
+	x [1]nih
+}
+
+// Type aliases inherit the go:notinheap-ness of the type they alias.
+type nihAlias = nih
+
+type embedAlias1 struct { // implicitly notinheap
+	x nihAlias
+}
+type embedAlias2 [1]nihAlias // implicitly notinheap
+
+func g() {
+	y = new(nih)              // ERROR "can't be allocated in Go"
+	y2 = new(struct{ x nih }) // ERROR "can't be allocated in Go"
+	y3 = new([1]nih)          // ERROR "can't be allocated in Go"
+	z = make([]nih, 1)        // ERROR "can't be allocated in Go"
+	z = append(z, x)          // ERROR "can't be allocated in Go"
+
+	sink = new(embed1)      // ERROR "can't be allocated in Go"
+	sink = new(embed2)      // ERROR "can't be allocated in Go"
+	sink = new(embed3)      // ERROR "can't be allocated in Go"
+	sink = new(embedAlias1) // ERROR "can't be allocated in Go"
+	sink = new(embedAlias2) // ERROR "can't be allocated in Go"
+
+	// Test for special case of OMAKESLICECOPY
+	x := make([]nih, n) // ERROR "can't be allocated in Go"
+	copy(x, z)
+	z = x
+}
+
+// Writes don't produce write barriers.
+
+var p *nih
+
+//go:nowritebarrier
+func h() {
+	y.next = p.next
+}