Merge branch '3.3' into 3.4

* 3.3:
  Fix optional cache warmers are always instantiated whereas they should be lazy-loaded
  add some \ on PHP_VERSION_ID for 2.8
  [Di] Remove closure-proxy arguments
  [PropertyInfo][DoctrineBridge] The bigint Doctrine's type must be converted to string

Author: nicolas-grekas

Store/SemaphoreStore.php

@@ -60,7 +60,7 @@ private function lock(Key $key, $blocking)
 
         $resource = sem_get(crc32($key));
 
-        if (PHP_VERSION_ID < 50601) {
+        if (\PHP_VERSION_ID < 50601) {
             if (!$blocking) {
                 throw new NotSupportedException(sprintf('The store "%s" does not supports non blocking locks.', get_class($this)));
             }

Tests/Store/BlockingStoreTestTrait.php

@@ -37,7 +37,7 @@ public function testBlockingLocks()
         // Amount a microsecond used to order async actions
         $clockDelay = 50000;
 
-        if (PHP_VERSION_ID < 50600 || defined('HHVM_VERSION_ID')) {
+        if (\PHP_VERSION_ID < 50600 || defined('HHVM_VERSION_ID')) {
             $this->markTestSkipped('The PHP engine does not keep resource in child forks');
 
             return;

Tests/Store/SemaphoreStoreTest.php

@@ -27,7 +27,7 @@ class SemaphoreStoreTest extends AbstractStoreTest
      */
     protected function getStore()
     {
-        if (PHP_VERSION_ID < 50601) {
+        if (\PHP_VERSION_ID < 50601) {
             $this->markTestSkipped('Non blocking semaphore are supported by PHP version greater or equals than 5.6.1');
         }