cmd/compile: fix ExampleInfo output

Move the "TODO" to outside of the function so that the "Output" comment
block is the last comment block. Output is only checked when it is the
last comment block. See golang/go#48362 for this issue.

Fixes: golang/go#48494

Change-Id: I7a31d7c13710e58fa876c96240a927a9bb8273ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/350995


Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: David Chase <drchase@google.com>

src/cmd/compile/internal/types2/example_test.go

@@ -216,36 +216,36 @@ func fib(x int) int {
 	// var x int:
 	//   defined at fib.go:8:10
 	//   used at 10:10, 12:13, 12:24, 9:5
-
-	// TODO(gri) Enable once positions are updated/verified
-	// Types and Values of each expression:
-	//  4: 8 | string              | type    : string
-	//  6:15 | len                 | builtin : func(string) int
-	//  6:15 | len(b)              | value   : int
-	//  6:19 | b                   | var     : fib.S
-	//  6:23 | S                   | type    : fib.S
-	//  6:23 | S(c)                | value   : fib.S
-	//  6:25 | c                   | var     : string
-	//  6:29 | "hello"             | value   : string = "hello"
-	//  8:12 | int                 | type    : int
-	//  8:17 | int                 | type    : int
-	//  9: 5 | x                   | var     : int
-	//  9: 5 | x < 2               | value   : untyped bool
-	//  9: 9 | 2                   | value   : int = 2
-	// 10:10 | x                   | var     : int
-	// 12: 9 | fib                 | value   : func(x int) int
-	// 12: 9 | fib(x - 1)          | value   : int
-	// 12: 9 | fib(x - 1) - fib(x - 2) | value   : int
-	// 12:13 | x                   | var     : int
-	// 12:13 | x - 1               | value   : int
-	// 12:15 | 1                   | value   : int = 1
-	// 12:20 | fib                 | value   : func(x int) int
-	// 12:20 | fib(x - 2)          | value   : int
-	// 12:24 | x                   | var     : int
-	// 12:24 | x - 2               | value   : int
-	// 12:26 | 2                   | value   : int = 2
 }
 
+// TODO(gri) Enable once positions are updated/verified
+// Types and Values of each expression:
+//  4: 8 | string              | type    : string
+//  6:15 | len                 | builtin : func(string) int
+//  6:15 | len(b)              | value   : int
+//  6:19 | b                   | var     : fib.S
+//  6:23 | S                   | type    : fib.S
+//  6:23 | S(c)                | value   : fib.S
+//  6:25 | c                   | var     : string
+//  6:29 | "hello"             | value   : string = "hello"
+//  8:12 | int                 | type    : int
+//  8:17 | int                 | type    : int
+//  9: 5 | x                   | var     : int
+//  9: 5 | x < 2               | value   : untyped bool
+//  9: 9 | 2                   | value   : int = 2
+// 10:10 | x                   | var     : int
+// 12: 9 | fib                 | value   : func(x int) int
+// 12: 9 | fib(x - 1)          | value   : int
+// 12: 9 | fib(x - 1) - fib(x - 2) | value   : int
+// 12:13 | x                   | var     : int
+// 12:13 | x - 1               | value   : int
+// 12:15 | 1                   | value   : int = 1
+// 12:20 | fib                 | value   : func(x int) int
+// 12:20 | fib(x - 2)          | value   : int
+// 12:24 | x                   | var     : int
+// 12:24 | x - 2               | value   : int
+// 12:26 | 2                   | value   : int = 2
+
 func mode(tv types2.TypeAndValue) string {
 	switch {
 	case tv.IsVoid():