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

test/mjsunit/binary-op-newspace.js

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-// Flags: --max-new-space-size=2 --noopt
+// Flags: --max_semi_space_size=1 --noopt
 
 // Check that a mod where the stub code hits a failure in heap number
 // allocation still works.
 
 function f(x) {
   return x % 3;
 }
 
 function testMod() {
   for (var i = 0; i < 40000; i++) {
@@ skipping 13 matching lines @@
 
 function testAdd() {
   var lhs = 17.42;
   var rhs = 42.17;
   for (var i = 0; i < 40000; i++) {
     assertEquals(59.59, g(lhs, rhs));
   }
 }
 
 testAdd();