public boolean isInstructionStart() {
			SequenceNumber seq = getSeqnum();
			return seq.getTime() == 0 && seq.getTarget().equals(at.address);
		}
Check if this op represents the start of an instruction

<p>
If this p-code op was produced by an inject, this will return false! It only returns true
for an op that is genuinely the first op in the result of {@link Instruction#getPcode()}.
<b>WARNING:</b> This should <em>not</em> be used for branching purposes, because branches
to a given address are meant to target any injections there, too. Currently, this is used
only to count the number of instructions actually executed.

@see JitBlock#instructionCount()
@see JitCompiledPassage#count(int, int)
@see JitPcodeThread#count(int, int)
@return true if this op is the first of an instruction
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/emu/jit/JitPassage.java