PPC aftermath: Fix regress-crbug-178790.

test/mjsunit/regress/regress-crbug-178790.js

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-// Flags: --stack-size=1300
+// Flags: --stack-size=1800
 
 // Create a regexp in the form of a?a?...a? so that fully
 // traversing the entire graph would be prohibitively expensive.
 // This should not cause time out.
 var r1 = "";
 for (var i = 0; i < 1000; i++) {
   r1 += "a?";
 }
 "test".match(RegExp(r1));
 
 var r2 = "";
 for (var i = 0; i < 100; i++) {
   r2 += "(a?|b?|c?|d?|e?|f?|g?)";
 }
 "test".match(RegExp(r2));
 
 // Create a regexp in the form of ((..(a)a..)a.
 // Compiling it causes EatsAtLeast to reach the maximum
 // recursion depth possible with a given budget.
 // This should not cause a stack overflow.
 var r3 = "a";
 for (var i = 0; i < 1000; i++) {
   r3 = "(" + r3 + ")a";
 }
 "test".match(RegExp(r3));