go/ssa/interp: skip failing test

This test introduces noise when using 'go test all' or 'go test ./...'
to test go/packages and the tools that depend on it.

Since it has been broken for around a month, skip it indefinitely.

Updates golang/go#27292

Change-Id: I796292310332712e14bc8a0b73e36a8ed6f8a73f
Reviewed-on: https://go-review.googlesource.com/137315
Run-TryBot: Bryan C. Mills <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Brad Fitzpatrick <[email protected]>

Author: Bryan C. Mills

go/ssa/interp/interp_test.go

@@ -103,8 +103,8 @@ var gorootTestTests = []string{
 	"floatcmp.go",
 	"crlf.go", // doesn't actually assert anything (runoutput)
 	// Slow tests follow.
-	"bom.go", // ~1.7s
-	"gc1.go", // ~1.7s
+	"bom.go",                         // ~1.7s
+	"gc1.go",                         // ~1.7s
 	"cmplxdivide.go cmplxdivide1.go", // ~2.4s
 
 	// Working, but not worth enabling:
@@ -156,9 +156,7 @@ var testdataTests = []string{
 type successPredicate func(exitcode int, output string) error
 
 func run(t *testing.T, dir, input string, success successPredicate) bool {
-	if testing.Short() {
-		t.Skip("test breaks regularly; skipping in short mode so a failure doesn't affect trybots or build.golang.org; golang.org/issue/27292")
-	}
+	t.Skip("golang.org/issue/27292")
 	if runtime.GOOS == "darwin" {
 		t.Skip("skipping on darwin until golang.org/issue/23166 is fixed")
 	}