cmd/compile: emit definition of 'any' when compiling runtime

Include the predefined type 'any' in the list of other important
predefined types that are emitted when compiling the runtime package
(uintptr, string, etc).

Fixes #49619.

Change-Id: I4a851ba2f302fbc3a425e65daa325c6bf83659da
Reviewed-on: https://go-review.googlesource.com/c/go/+/364377
Trust: Than McIntosh <[email protected]>
Trust: Dan Scales <[email protected]>
Run-TryBot: Than McIntosh <[email protected]>
TryBot-Result: Go Bot <[email protected]>
Reviewed-by: Dan Scales <[email protected]>

Author: thanm

src/cmd/compile/internal/reflectdata/reflect.go

@@ -1384,6 +1384,7 @@ func WriteBasicTypes() {
 		}
 		writeType(types.NewPtr(types.Types[types.TSTRING]))
 		writeType(types.NewPtr(types.Types[types.TUNSAFEPTR]))
+		writeType(types.AnyType)
 
 		// emit type structs for error and func(error) string.
 		// The latter is the type of an auto-generated wrapper.

test/fixedbugs/issue49619.go

@@ -0,0 +1,19 @@
+// build
+
+// 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.
+
+// This testcase caused a linker crash in DWARF generation.
+
+package main
+
+//go:noinline
+func f() any {
+	var a []any
+	return a[0]
+}
+
+func main() {
+	f()
+}