[Debug] fix #10771 DebugClassLoader can't load PSR4 libs
bug #10776 [Debug] fix #10771 DebugClassLoader can't load PSR4 libs (nicolas-grekas)

This PR was merged into the 2.5-dev branch.

Discussion
----------

[Debug] fix #10771 DebugClassLoader can't load PSR4 libs

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #10771
| License       | MIT
| Doc PR        | none

Commits
-------

e3566c2 [Debug] fix #10771 DebugClassLoader can't load PSR4 libs
[FrameworkBundle] removed support for HHVM built-in web server as it is deprecated now
feature #10786 [FrameworkBundle] removed support for HHVM built-in web server as it is deprecated now (fabpot)

This PR was merged into the 2.5-dev branch.

Discussion
----------

[FrameworkBundle] removed support for HHVM built-in web server as it is deprecated now

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #10774
| License       | MIT
| Doc PR        | n/a

Commits
-------

7f7e2d8 [FrameworkBundle] removed support for HHVM built-in web server as it is deprecated now