minor symfony#18906 [PropertyAccess] Fix for PHP 7.0.7 (nicolas-grekas)

This PR was merged into the 2.3 branch.

Discussion
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[PropertyAccess] Fix for PHP 7.0.7

| Q             | A
| ------------- | ---
| Branch?       | 2.3
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

This is what break travis currently.
See https://3v4l.org/r37rY

Commits
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a125af7 [PropertyAccess] Fix for PHP 7.0.7

Author: nicolas-grekas

src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorCollectionTest.php

@@ -173,7 +173,9 @@ public function testSetValueUpdatesNestedArrayAccess()
      */
     public function testSetValueThrowsExceptionIfArrayAccessExpected()
     {
-        $this->propertyAccessor->setValue(new \stdClass(), '[firstName]', 'Bernhard');
+        $object = new \stdClass();
+
+        $this->propertyAccessor->setValue($object, '[firstName]', 'Bernhard');
     }
 
     public function testSetValueCallsAdderAndRemoverForCollections()

src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorTest.php

@@ -311,7 +311,9 @@ public function testSetValueCamelizesSetterNames()
      */
     public function testSetValueThrowsExceptionIfGetterIsNotPublic()
     {
-        $this->propertyAccessor->setValue(new Author(), 'privateSetter', 'foobar');
+        $object = new Author();
+
+        $this->propertyAccessor->setValue($object, 'privateSetter', 'foobar');
     }
 
     /**
@@ -414,7 +416,9 @@ public function getValidPropertyPaths()
      */
     public function testThrowTypeError()
     {
-        $this->propertyAccessor->setValue(new TypeHinted(), 'date', 'This is a string, \DateTime expected.');
+        $object = new TypeHinted();
+
+        $this->propertyAccessor->setValue($object, 'date', 'This is a string, \DateTime expected.');
     }
 
     public function testSetTypeHint()