cmd/dist: let the three runtime -quick tests run simultaneously

For golang#65164

Change-Id: Id797a402fffd70643ebaae74f4450dacfa2b6dd3

src/cmd/dist/test.go

@@ -705,18 +705,45 @@ func (t *tester) registerTests() {
 
 	// Runtime CPU tests.
 	if !t.compileOnly && t.hasParallelism() {
-		t.registerTest("GOMAXPROCS=2 runtime -cpu=1,2,4 -quick",
+		t.registerTest("GOMAXPROCS=2 runtime -cpu=1 -quick",
 			&goTest{
-				variant:   "cpu124",
+				variant:   "cpu1",
 				timeout:   300 * time.Second,
-				cpu:       "1,2,4",
+				cpu:       "1",
 				short:     true,
 				testFlags: []string{"-quick"},
 				// We set GOMAXPROCS=2 in addition to -cpu=1,2,4 in order to test runtime bootstrap code,
 				// creation of first goroutines and first garbage collections in the parallel setting.
 				env: []string{"GOMAXPROCS=2"},
 				pkg: "runtime",
-			})
+			},
+		)
+		t.registerTest("GOMAXPROCS=2 runtime -cpu=2 -quick",
+			&goTest{
+				variant:   "cpu2",
+				timeout:   300 * time.Second,
+				cpu:       "2",
+				short:     true,
+				testFlags: []string{"-quick"},
+				// We set GOMAXPROCS=2 in addition to -cpu=1,2,4 in order to test runtime bootstrap code,
+				// creation of first goroutines and first garbage collections in the parallel setting.
+				env: []string{"GOMAXPROCS=2"},
+				pkg: "runtime",
+			},
+		)
+		t.registerTest("GOMAXPROCS=2 runtime -cpu=4 -quick",
+			&goTest{
+				variant:   "cpu4",
+				timeout:   300 * time.Second,
+				cpu:       "4",
+				short:     true,
+				testFlags: []string{"-quick"},
+				// We set GOMAXPROCS=2 in addition to -cpu=1,2,4 in order to test runtime bootstrap code,
+				// creation of first goroutines and first garbage collections in the parallel setting.
+				env: []string{"GOMAXPROCS=2"},
+				pkg: "runtime",
+			},
+		)
 	}
 
 	// GOEXPERIMENT=rangefunc tests