cmd/compile: don't accumulate duplicated named slots

Currently, in expand_calls, for each appearance of a named
variables's component, we add the named slot to f.Names list. If
a variable appears many times, we add it to f.Names many times.
Furthure, for each duplicated named slot, its entry in
f.NamedValues is a slice that contains all Values associated with
that name. This leads to quadratic behavior when iterating named
values like

	for _, name := range f.Names {
		for _, v := range f.NamedValues[name] {
			...
		}
	}

This CL makes it not to add duplicated entries to f.Names.

Change-Id: I82a8d009db81ecf48b4577e0bca501feff677cdf
Reviewed-on: https://go-review.googlesource.com/c/go/+/312093
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>

src/cmd/compile/internal/ssa/expand_calls.go

@@ -1378,9 +1378,11 @@ func expandCalls(f *Func) {
 		// Leaf types may have debug locations
 		if !x.isAlreadyExpandedAggregateType(v.Type) {
 			for _, l := range locs {
+				if _, ok := f.NamedValues[l]; !ok {
+					f.Names = append(f.Names, l)
+				}
 				f.NamedValues[l] = append(f.NamedValues[l], v)
 			}
-			f.Names = append(f.Names, locs...)
 			continue
 		}
 		// Not-leaf types that had debug locations need to lose them.