public MaskedLong shiftRightPositional(long n) {
		return fromMaskAndValue(this.msk >>> n, this.val >>> n);
	}
Shift the bits positionally {@code n} positions right

<p>
This fills the left with unknown bits

@param n
@return
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/assembler/sleigh/expr/MaskedLong.java