class_docstr: Accepts a parsed json produced by llvm-cov export -- typically,
  representing a single C++ test and produces a list
  of CoverageRecord(s).
code: def __init__(self, llvm_coverage: Dict[str, Any]) -> None:
      self._llvm_coverage = llvm_coverage
  
imports: from typing import Any, Dict, List, Set, Tuple
  from .coverage_record import CoverageRecord
  from .llvm_coverage_segment import LlvmCoverageSegment, parse_segments
label_desc: Use image node_id 1 to create a new LlvmCoverageParser object  with example: obj = LlvmCoverageParser(llvm_coverage)