Simplify ConfigureHeap and change --max_new_space_size to --max_semi_space_size.

test/mjsunit/compiler/math-floor-local.js

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-// Flags: --max-new-space-size=2 --allow-natives-syntax
+// Flags: --max_semi_space_size=1 --allow-natives-syntax
 
 // Test inlining of Math.floor when assigned to a local.
 var test_id = 0;
 
 function testFloor(expect, input) {
   var test = new Function('n',
                           '"' + (test_id++) +
                           '";var f = Math.floor; return f(n)');
   assertEquals(expect, test(input));
   assertEquals(expect, test(input));
@@ skipping 114 matching lines @@
   while (--i > 0) {
     ret += Math.floor(n);
   }
   return ret;
 }
 assertEquals(-0, floorsum(1, -0));
 %OptimizeFunctionOnNextCall(floorsum);
 // The optimized function will deopt.  Run it with enough iterations to try
 // to optimize via OSR (triggering the bug).
 assertEquals(-0, floorsum(100000, -0));