Function pushHiddenContext

docs/index.js:6947–6952

(fiber, context)

  currentTreeHiddenStackCursor = createCursor(null),
  prevEntangledRenderLanesCursor = createCursor(0);
function pushHiddenContext(fiber, context) {
  fiber = entangledRenderLanes;
  push(prevEntangledRenderLanesCursor, fiber);
  push(currentTreeHiddenStackCursor, context);
  entangledRenderLanes = fiber | context.baseLanes;
}
function reuseHiddenContextOnStack() {
  push(prevEntangledRenderLanesCursor, entangledRenderLanes);
  push(currentTreeHiddenStackCursor, currentTreeHiddenStackCursor.current);