Fix environment of the optimized version of the _SetValueOf intrinsic.

test/mjsunit/regress/setvalueof-deopt.js

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 // Flags: --allow-natives-syntax
 
-function g() {
-  this.x = this;
+function g(x, y) {
+  return y;
 }
 
-function f() {
-  return new g();
+function f(deopt) {
+  return g(%_SetValueOf(1, 1), deopt + 0);
 }
 
-f();
-f();
+f(0);
+f(0);
+f(0);
 %OptimizeFunctionOnNextCall(f);
-f();
+assertEquals("result0", f("result"));