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Added hasInstance well known symbol implementation for Function.prototype. This change however does not implement the ES2015 `instanceof` operator changes. JerryScript-DCO-1.0-Signed-off-by: Peter Gal pgal.u-szeged@partner.samsung.com JerryScript-DCO-1.0-Signed-off-by: Dániel Vince vinced@inf.u-szeged.hu