go/internal/gccgoimporter: fix up gccgo installation test

Change the TestInstallationImporter testpoint to query type
information for sort.Search instead of sort.Ints. The latter function
changed recently (1.16 timeframe), parameter "a" is now "x". A better
candidate for this sort of query is sort.Search, which has been stable
for a while.

Fixes #44425.

Change-Id: I314476eac0b0802f86f5cbce32195cab2926db83
Reviewed-on: https://go-review.googlesource.com/c/go/+/294290
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/go/internal/gccgoimporter/gccgoinstallation_test.go

@@ -184,7 +184,7 @@ func TestInstallationImporter(t *testing.T) {
 		{pkgpath: "io", name: "ReadWriter", want: "type ReadWriter interface{Reader; Writer}"},
 		{pkgpath: "math", name: "Pi", want: "const Pi untyped float"},
 		{pkgpath: "math", name: "Sin", want: "func Sin(x float64) float64"},
-		{pkgpath: "sort", name: "Ints", want: "func Ints(a []int)"},
+		{pkgpath: "sort", name: "Search", want: "func Search(n int, f func(int) bool) int"},
 		{pkgpath: "unsafe", name: "Pointer", want: "type Pointer"},
 	} {
 		runImporterTest(t, imp, nil, &test)