protected void truncateOrDelete(TraceInstruction exists) {
			if (exists.getStartSnap() < lifespan.lmin()) {
				exists.setEndSnap(lifespan.lmin() - 1);
			}
			else {
				exists.delete();
			}
		}
Construct an adder

<p>
This should only be done after the entire instruction set has been checked

@param skipDelaySlots addresses of delay slotted instructions to skip
@param lifespan the lifespan for each instruction
@param platform the platform (language, compiler) for the instructions
@param block the block to add
@param errorAddress the address of the first error in the block, if any
@param conflict a description of the error, if any
@param conflictCodeUnit if a conflict, the code unit that already exists
@param overwrite true to overwrite existing defined units
Ghidra/Debug/Framework-TraceModeling/src/main/java/ghidra/trace/database/listing/DBTraceInstructionsView.java