Ensure consistency of Math.sqrt on Intel platforms.

test/mjsunit/regress/regress-sqrt.js

+// Copyright 2012 the V8 project authors. All rights reserved.
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+
+// Flags: --allow-natives-syntax
+
+// Check that Math.sqrt returns the same value regardless of being
+// optimized or not.
+
+function f(x) {
+  return Math.sqrt(x);
+}
+
+var x = 7.0506280066499245e-233;
+
+var a = f(x);
+
+f(0.1);
+f(0.2);
+%OptimizeFunctionOnNextCall(f);
+
+var b = f(x);
+
+assertEquals(a, b);