Move ReactFiberTreeReflection to react-reconciler/reflection (#11683)

* Move ReactFiberTreeReflection to react-reconciler/reflection #11659

* Use * for react-reconciler

We don't know the latest local version, and release script currently doesn't bump deps automatically.

* Remove unused field

* Use CommonJS in entry point for consistency

* Undo the CommonJS change

I didn't realize it would break the build.

* Record sizes

* Remove reconciler fixtures

They're unnecessary now that we run real tests on reconciler bundles.

scripts/circleci/build.sh

@@ -10,8 +10,3 @@ yarn build --extract-errors
 
 # Do a sanity check on bundles
 yarn lint-build
-
-# Check that the standalone reconciler isn't borked
-cd fixtures/reconciler
-yarn
-yarn test

scripts/rollup/bundles.js

@@ -211,6 +211,16 @@ const bundles = [
     externals: ['react'],
   },
 
+  /******* Reflection *******/
+  {
+    label: 'reconciler-reflection',
+    moduleType: RENDERER_UTILS,
+    bundleTypes: [NODE_DEV, NODE_PROD],
+    entry: 'react-reconciler/reflection',
+    global: 'ReactFiberTreeReflection',
+    externals: [],
+  },
+
   /******* React Call Return (experimental) *******/
   {
     label: 'react-call-return',

scripts/rollup/results.json

@@ -189,8 +189,8 @@
       "gzip": 2725
     },
     "react-noop-renderer.development.js (NODE_DEV)": {
-      "size": 277788,
-      "gzip": 58527
+      "size": 17474,
+      "gzip": 4855
     },
     "react-reconciler.development.js (NODE_DEV)": {
       "size": 262177,
@@ -217,8 +217,16 @@
       "gzip": 3917
     },
     "react-noop-renderer.production.min.js (NODE_PROD)": {
-      "size": 45144,
-      "gzip": 14079
+      "size": 6011,
+      "gzip": 2418
+    },
+    "react-reconciler-reflection.development.js (NODE_DEV)": {
+      "size": 10398,
+      "gzip": 3198
+    },
+    "react-reconciler-reflection.production.min.js (NODE_PROD)": {
+      "size": 2408,
+      "gzip": 1062
     }
   }
 }