internal/typesinternal/typeindex: suppress test on js

Fixes golang/go#73043

Change-Id: Ia0524bb45562095356984693f705a51fb0a35224
Reviewed-on: https://go-review.googlesource.com/c/tools/+/660735
LUCI-TryBot-Result: Go LUCI <[email protected]>
Auto-Submit: Alan Donovan <[email protected]>
Reviewed-by: Jonathan Amsterdam <[email protected]>

Author: adonovan

internal/typesinternal/typeindex/typeindex_test.go

@@ -15,10 +15,12 @@ import (
 	"golang.org/x/tools/go/packages"
 	"golang.org/x/tools/go/types/typeutil"
 	"golang.org/x/tools/internal/astutil/cursor"
+	"golang.org/x/tools/internal/testenv"
 	"golang.org/x/tools/internal/typesinternal/typeindex"
 )
 
 func TestIndex(t *testing.T) {
+	testenv.NeedsGoPackages(t)
 	var (
 		pkg        = loadNetHTTP(t)
 		inspect    = inspector.New(pkg.Syntax)