Disable gc stress mode for mjsunit timer test.

test/mjsunit/timer.js

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+// Flags: --allow-natives-syntax
+
 // Tests timer milliseconds granularity.
 
+// Don't run this test in gc stress mode. Time differences may be long
+// due to garbage collections.
+%SetFlags("--gc-interval=-1");
+%SetFlags("--nostress-compaction");
+
 (function run() {
   var start_test = Date.now();
   // Let the retry run for maximum 100ms to reduce flakiness.
   for (var start = Date.now(); start - start_test < 100; start = Date.now()) {
     var end = Date.now();
     while (end - start == 0) {
       end = Date.now();
     }
     if (end - start == 1) {
       // Found milliseconds granularity.
       return;
     } else {
       print("Timer difference too big: " + (end - start) + "ms");
     }
   }
   assertTrue(false);
 })()