Fix sloppy mode arguments uninitialized value use
MemorySanitizer complained about uninitialized reads in the indexed property code path in JS_GetPropertyValue() with JS_CLASS_MAPPED_ARGUMENTS objects.
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@ -14774,6 +14774,8 @@ static JSValue js_build_mapped_arguments(JSContext *ctx, int argc,
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if (JS_IsException(val))
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return val;
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p = JS_VALUE_GET_OBJ(val);
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p->u.array.u.values = NULL;
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p->u.array.count = 0;
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/* add the length field (cannot fail) */
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pr = add_property(ctx, p, JS_ATOM_length,
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