private void fireBlocksJoined(MemoryBlock newBlock, Address oldBlockStartAddr) {
		program.setChanged(ProgramEvent.MEMORY_BLOCKS_JOINED, oldBlockStartAddr, newBlock);
	}
Two blocks have been joined producing newBlock. The block which was eliminated can be
identified using the oldBlockStartAddr.

@param newBlock new joined memory block
@param oldBlockStartAddr original start address of affected block
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/mem/MemoryMapDB.java