Intl.NumberFormat and Intl.PluralRules don't agree when to call SetNumberFormatDigitOptions

[anba]

• Intl.NumberFormat calls SetNumberFormatDigitOptions after reading "notation", but before reading "compactDisplay".
• Intl.PluralRules calls SetNumberFormatDigitOptions after reading both "notation" and "compactDisplay".

Note: This was explicitly requested in #1019 (comment), but isn't it better to align Intl.NumberFormat and Intl.PluralRules?