Store copied value rather than the original double.

test/mjsunit/regress/regress-convert-function-to-double.js

Index: test/mjsunit/regress/regress-convert-function-to-double.js
diff --git a/test/mjsunit/regress/regress-crbug-172345.js b/test/mjsunit/regress/regress-convert-function-to-double.js
similarity index 93%
copy from test/mjsunit/regress/regress-crbug-172345.js
copy to test/mjsunit/regress/regress-convert-function-to-double.js
index 711501caa791f2974635ac4dd894568a2e3fc982..fca44f96324383a43daf393174f845d14f94bd9e 100644
--- a/test/mjsunit/regress/regress-crbug-172345.js
+++ b/test/mjsunit/regress/regress-convert-function-to-double.js
@@ -25,10 +25,12 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-function f(a,i) {
-  return a[i];
+function f(v) {
+  this.func = v;
 }
 
-f([1,2,3], "length");
-f([1,2,3], "length");
-f([1,2,3], 2);
+var o1 = new f(f);
+var d = 1.4;
+var o2 = new f(d);
+o2.func = 1.8;
+assertEquals(1.4, d)