Ensure mjsunit tests use dashes not underscores in flags directives.

test/mjsunit/math-floor-of-div.js

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-// Flags: --allow-natives-syntax --nouse_inlining --enable_sudiv
+// Flags: --allow-natives-syntax --nouse-inlining --enable-sudiv
 
 // Use this function as reference. Make sure it is not inlined.
 function div(a, b) {
   return a / b;
 }
 
 var limit = 0x1000000;
 var exhaustive_limit = 100;
 var step = 10;
 var values = [0x10000001,
@@ skipping 251 matching lines @@
 
 // Test for flooring division with negative dividend.
 function flooring_div_by_3(y) {
   return Math.floor(y / 3);
 }
 
 assertEquals(-1, flooring_div_by_3(-2));
 assertEquals(-1, flooring_div_by_3(-2));
 %OptimizeFunctionOnNextCall(flooring_div_by_3);
 assertEquals(-1, flooring_div_by_3(-2));