cmd/link: skip a couple of DWARF tests in short mode

Rejigger the DWARF tests to ensure that they run in a reasonable
amount of time in short mode, particularly the "abstract origin
sanity" testpoints.

Updates #26470

Change-Id: Idae9763ac20ea999fa394595aacfcd1e271293ae
Reviewed-on: https://go-review.googlesource.com/125295
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Austin Clements <austin@google.com>

src/cmd/link/internal/ld/dwarf_test.go

@@ -24,7 +24,8 @@ import (
 const (
 	DefaultOpt = "-gcflags="
 	NoOpt      = "-gcflags=-l -N"
-	OptInl4    = "-gcflags=all=-l=4"
+	OptInl4    = "-gcflags=-l=4"
+	OptAllInl4 = "-gcflags=all=-l=4"
 )
 
 func TestRuntimeTypesPresent(t *testing.T) {
@@ -610,7 +611,9 @@ func main() {
 
 	// Note: this is a build with "-l=4", as opposed to "-l -N". The
 	// test is intended to verify DWARF that is only generated when
-	// the inliner is active.
+	// the inliner is active. We're only going to look at the DWARF for
+	// main.main, however, hence we build with "-gcflags=-l=4" as opposed
+	// to "-gcflags=all=-l=4".
 	f := gobuild(t, dir, prog, OptInl4)
 
 	d, err := f.DWARF()
@@ -794,6 +797,10 @@ func abstractOriginSanity(t *testing.T, gopathdir string, flags string) {
 func TestAbstractOriginSanity(t *testing.T) {
 	testenv.MustHaveGoBuild(t)
 
+	if testing.Short() {
+		t.Skip("skipping test in short mode.")
+	}
+
 	if runtime.GOOS == "plan9" {
 		t.Skip("skipping on plan9; no DWARF symbol table in executables")
 	}
@@ -803,7 +810,7 @@ func TestAbstractOriginSanity(t *testing.T) {
 
 	if wd, err := os.Getwd(); err == nil {
 		gopathdir := filepath.Join(wd, "testdata", "httptest")
-		abstractOriginSanity(t, gopathdir, OptInl4)
+		abstractOriginSanity(t, gopathdir, OptAllInl4)
 	} else {
 		t.Fatalf("os.Getwd() failed %v", err)
 	}