Issue #2535284 by jibran: Move block_install hook to block.install file

core/modules/block/block.install

+<?php
+
+/**
+ * @file
+ * Contains install and update functions for Block.
+ */
+
+use Drupal\Core\Cache\Cache;
+
+/**
+ * Implements hook_install().
+ */
+function block_install() {
+  // Because the Block module upon installation unconditionally overrides all
+  // HTML output by selecting a different page display variant, we must
+  // invalidate all cached HTML output.
+  Cache::invalidateTags(['rendered']);
+}

core/modules/block/block.module

@@ -7,7 +7,6 @@
 
 use Drupal\block\BlockInterface;
 use Drupal\Component\Utility\Html;
-use Drupal\Core\Cache\Cache;
 use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\Core\Url;
 use Drupal\language\ConfigurableLanguageInterface;
@@ -282,13 +281,3 @@ function block_configurable_language_delete(ConfigurableLanguageInterface $langu
     }
   }
 }
-
-/**
- * Implements hook_install().
- */
-function block_install() {
-  // Because the Block module upon installation unconditionally overrides all
-  // HTML output by selecting a different page display variant, we must
-  // invalidate all cached HTML output.
-  Cache::invalidateTags(['rendered']);
-}