Last bunch of NumberFormat speedups.

Don't mess around with setCurrency in DecimalFormat.copySymbols when we're
going to override any effect that call will have had in the next few lines:
we always call setCurrencySymbol and setInternationalCurrencySymbol, so
setCurrency is just wasting time.

Replaces the NativeDecimalFormat.UNumberFormatSymbol enum -- which was only used
for getting ints to pass to native code, using Enum.ordinal -- with ints.

Adds a constructor to the java.text DecimalFormat so we can avoid cloning the
DecimalFormatSymbols object we create for its private use.

This is another 10% shaved off.

I've also removed an unused local from the icu4jni DecimalFormat, so I can
remove a then-unused getLocale method from the ICU DecimalFormatSymbols.

I've rewritten the icu4jni DecimalFormatSymbols.clone to remove the scary
constructor that took an arbitrary int and treated it as a uintptr_t when
talking to native code.

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