Fix incorrect error when calling non-existent symbol property #1501
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We threw 'Object does not support ToString' when trying to call a symbol
property on an object when that property didn't exist. This happened
because we try to do a toString conversion on the index var for the
error message string, but Symbol objects do not support toString via
JavascriptConversion::ToString().
Fix it by special casing symbol properties and directly calling the
static JavascriptSymbol::ToString method to get a useful string.
Fixes #1409