Bug 1870945 - Mark various gc tests as slow r=sfink

Depends on D196921

Differential Revision: https://phabricator.services.mozilla.com/D196922

js/src/jit-test/tests/gc/bug-1303015.js

@@ -1,4 +1,4 @@
-// |jit-test| skip-if: !('oomTest' in this)
+// |jit-test| slow; skip-if: !('oomTest' in this)
 
 var x = ``.split();
 oomTest(function() {

js/src/jit-test/tests/gc/bug-1607495.js

@@ -1,3 +1,5 @@
+// |jit-test| slow;
+
 gczeal(14, 2);
 var g32 = newGlobal();
 let wr6 = new g32.WeakRef(newGlobal({

js/src/jit-test/tests/gc/bug-1620213.js

@@ -1,3 +1,5 @@
+// |jit-test| slow;
+
 for (var i = 0; i < 32768; i++) {
   new ArrayBuffer(1024*1024);
 }

js/src/jit-test/tests/gc/bug-1667336.js

@@ -1,4 +1,4 @@
-// |jit-test| --ion-offthread-compile=off; skip-if: helperThreadCount() === 0
+// |jit-test| slow; --ion-offthread-compile=off; skip-if: helperThreadCount() === 0
 
 var g = newGlobal();
 gczeal(9, 1);

js/src/jit-test/tests/gc/bug-1851619.js

@@ -1,4 +1,5 @@
-// Bug 1851619: Shouldn't crash. |jit-test| exitstatus: 3
+//  |jit-test| slow; exitstatus: 3
+// Bug 1851619: Shouldn't crash.
 
 // This test triggers a stack overflow, then calls a finalization registry
 // cleanup callback that previously used data that had already been discarded.