[mjsunit] Remove obsolete nosse2 tests.

test/mjsunit/regress/regress-x87.js

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-// Flags: --allow-natives-syntax --noenable-sse2
+// Flags: --allow-natives-syntax
 
 // Regression for register allocation.
 var x;
 var a = new Float32Array([1,2, 4, 6, 8, 11, NaN, 1/0, -3])
 var val = 2.1*a[1]*a[0]*a[1*2*3*0]*a[1*1]*1.0;
 assertEquals(8.4, val);
 
 // Regression for double-phis
 var a;
 var t = true;
 var res = [2.5, 2];
 for (var i = 0; i < 2; i++) {
   if (t) {
     a = 1.5;
   } else {
     a = true;
   }
   assertEquals(res[i], a+1);
   t = false;
 }