class_docstr: Replacer class for replacing HLO instructions by FileCheck captures.
code: def __init__(self):
      self._counter = -1
      self._replacement_cache = {}
  
file_path: tensorflow/third_party/xla/xla/service/generate_test_hlo_checks.py
imports: import re
  import shutil
  import sys
  import tempfile
  from typing import Dict
label_desc: Use image node_id 1 to create a new FileCheckVarReplacer object  with example: obj = FileCheckVarReplacer()