Speed up some mjsunit test cases and clean up test expectations for arm and mips.

test/mjsunit/compiler/alloc-number-debug.js

-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2014 the V8 project authors. All rights reserved.
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+// Flags: --allow-natives-syntax
 
 // Try to get a GC because of a heap number allocation while we
 // have live values (o) in a register.
 function f(o) {
   var x = 1.5;
   var y = 2.5;
-  for (var i = 1; i < 100000; i+=2) o.val = x + y + i;
+  for (var i = 1; i < 3; i += 1) {
+    %SetAllocationTimeout(1, 0, false);
+    o.val = x + y + i;
+    %SetAllocationTimeout(-1, -1, true);
+  }
   return o;
 }
 
 var o = { val: 0 };
-for (var i = 0; i < 100; i++) f(o);
+f(o);