makeDoWhileBody() {
    const context = this.loopContext;
    const forkContext = this.forkContext;
    const bodySegments = forkContext.makeNext(-1, -1);

    // Update state.
    context.entrySegments = bodySegments;
    forkContext.replaceHead(bodySegments);
  }
Makes a code path segment for the body part of a DoWhileStatement.
@returns {void}