cmd/go: convert TestCgoConsistentResults to the script framework

The call to tooSlow is rewritten into a check for [short].

Part of converting all tests to script framework to improve
test parallelism.

Updates #36320
Updates #17751

Change-Id: I1f3e7664d575219b6fc525bd88babed15d1bd3b2
Reviewed-on: https://go-review.googlesource.com/c/go/+/212622
Reviewed-by: Jay Conrod <jayconrod@google.com>

src/cmd/go/go_test.go

@@ -3320,38 +3320,6 @@ func TestParallelTest(t *testing.T) {
 	tg.run("test", "-p=4", "p1", "p2", "p3", "p4")
 }
 
-func TestCgoConsistentResults(t *testing.T) {
-	tooSlow(t)
-	if !canCgo {
-		t.Skip("skipping because cgo not enabled")
-	}
-	switch runtime.GOOS {
-	case "solaris", "illumos":
-		testenv.SkipFlaky(t, 13247)
-	}
-
-	tg := testgo(t)
-	defer tg.cleanup()
-	tg.parallel()
-	tg.makeTempdir()
-	tg.setenv("GOPATH", filepath.Join(tg.pwd(), "testdata"))
-	exe1 := tg.path("cgotest1" + exeSuffix)
-	exe2 := tg.path("cgotest2" + exeSuffix)
-	tg.run("build", "-o", exe1, "cgotest")
-	tg.run("build", "-x", "-o", exe2, "cgotest")
-	b1, err := ioutil.ReadFile(exe1)
-	tg.must(err)
-	b2, err := ioutil.ReadFile(exe2)
-	tg.must(err)
-
-	if !tg.doGrepMatch(`-fdebug-prefix-map=\$WORK`, &tg.stderr) {
-		t.Skip("skipping because C compiler does not support -fdebug-prefix-map")
-	}
-	if !bytes.Equal(b1, b2) {
-		t.Error("building cgotest twice did not produce the same output")
-	}
-}
-
 // Issue 14444: go get -u .../ duplicate loads errors
 func TestGoGetUpdateAllDoesNotTryToLoadDuplicates(t *testing.T) {
 	testenv.MustHaveExternalNetwork(t)

src/cmd/go/testdata/script/build_cgo_consistent_results.txt

@@ -0,0 +1,19 @@
+[short] skip
+[!cgo] skip
+
+[solaris] skip "skipping on Solaris; see golang.org/issue/13247"
+[illumos] skip "skipping on Solaris; see golang.org/issue/13247"
+
+go build -o $WORK/exe1$GOEXE cgotest
+go build -x -o $WORK/exe2$GOEXE cgotest
+
+# TODO(matloob): skip if stderr does not contain '-fdebug-prefix-map=\$WORK'
+
+cmp $WORK/exe1$GOEXE $WORK/exe2$GOEXE
+
+-- cgotest/m.go --
+package cgotest
+
+import "C"
+
+var _ C.int