Set max new space size in tests to proper MB value.

test/mjsunit/math-abs.js

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-// Flags: --allow-natives-syntax
+// Flags: --max-new-space-size=2 --allow-natives-syntax
 
 function zero() {
   var x = 0.5;
   return (function() { return x - 0.5; })();
 }
 
 function test() {
   assertEquals(0, Math.abs(0));
   assertEquals(0, Math.abs(zero()));
   assertEquals(0, Math.abs(-0));
@@ skipping 74 matching lines @@
 // Regression test for SMI input of Math.abs on X64, see:
 // https://codereview.chromium.org/21180004/
 var a = [-1, -2];
 function foo2() {
   return Math.abs(a[0]);
 }
 assertEquals(1, foo2());
 assertEquals(1, foo2());
 %OptimizeFunctionOnNextCall(foo2);
 assertEquals(1, foo2());