_getOpcodes(viaIR) {
    let opcodes = {
      "PUSH1": true
    };

    if (!viaIR) return opcodes;

    for (let i = 2; i <= 32; i++) {
      const key = "PUSH" + i;
      opcodes[key] = viaIR;
    };

    for (let i = 1; i <= 16; i++ ) {
      const key = "DUP" + i;
      opcodes[key] = viaIR;
    }

    for (let i = 1; i <= 16; i++ ) {
      const key = "SWAP" + i;
      opcodes[key] = viaIR;
    }

    return opcodes;
  }
Generates a list of all the opcodes to inspect for instrumentation hashes
When viaIR is true, it includes all DUPs and PUSHs, so things are a little slower.
@param {boolean} viaIR