public int getInitializedByteCount(int pageOffset, int size) {
		return getInitializedByteCount(initializedMask, pageOffset, size);
	}
Get number of leading bytes within page range which have been 
initialized.
@param pageOffset
@param size
@return number of leading bytes within page range which have been 
initialized.
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/memstate/MemoryPage.java