Allow multiple lines of custom flags in javascript tests.

test/mjsunit/compiler/alloc-object-huge.js

 // Copyright 2012 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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 //       notice, this list of conditions and the following disclaimer.
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-// Flags: --allow-natives-syntax --inline-construct --max-inlined-source-size=999999 --max-inlined-nodes=999999 --max-inlined-nodes-cumulative=999999
+// Flags: --allow-natives-syntax --inline-construct
+// Flags: --max-inlined-source-size=999999 --max-inlined-nodes=999999
+// Flags: --max-inlined-nodes-cumulative=999999
 
 // Test that huge constructors (more than 256 this assignments) are
 // handled correctly.
 
 // Test huge constructor when being inlined into hydrogen.
 function test() {
   return new huge();
 }
 test();
 test();
@@ skipping 260 matching lines @@
   this.foo249 = 249;
   this.foo250 = 250;
   this.foo251 = 251;
   this.foo252 = 252;
   this.foo253 = 253;
   this.foo254 = 254;
   this.foo255 = 255;
   this.foo256 = 256;
   this.foo257 = 257;
 }