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

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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 < 3; i += 1) {
    %SetAllocationTimeout(1, 0, false);
    o.val = x + y + i;
    %SetAllocationTimeout(-1, -1, true);
  }
  return o;
}

var o = { val: 0 };
f(o);