public AddrCtx getOpEntry(PcodeOp op) {
		return entries.get(op);
	}
Check if a given p-code op is the first of an instruction.

<p>
<b>NOTE</b>: If an instruction is at an address with an inject, then the first op produced by
the inject is considered the "entry" to the instruction. This is to ensure that any control
flow to the injected address executes the injected code, not just the instruction's code.

@param op the op to check.
@return the address-context pair that generated the op, if it is the first there, or
        {@code null}
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/emu/jit/JitPassage.java