Add X87 implementations for Integer32ToDouble, DoubleToI, DoubleToSmi

test/mjsunit/regress/regress-x87.js

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-// Flags: --use-osr
+// Flags: --allow-natives-syntax --noenable-sse2
 
-function f(x) {
-  var sum = 0;
-  var outer = 1000000;
-  var a = 1, b = 2, c = 3, d = 4, e = 5;
-  while (outer > 0) {
-    a = a + 5;
-    b = b + 4;
-    c = c + 3;
-    d = d + 2;
-    e = e + 1;
-    outer--;
+// 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;
   }
-  return a + b + c + d + e;
+  assertEquals(res[i], a+1);
+  t = false;
 }
-
-assertEquals(15000015, f(5));