Remove aligned '=>' and '='
minor #12413 Remove aligned '=>' and '=' (disquedur)

This PR was merged into the 2.6-dev branch.

Discussion
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Remove aligned '=>' and '='

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | [https://github.com/symfony/symfony/issues/12284]
| License       | MIT

PR for 2.3 branch : https://github.com/symfony/symfony/pull/12293
PR for 2.5 branch : https://github.com/symfony/symfony/pull/12362

Commits
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ac1f2b7 Remove aligned '=>' and '='
[VarDumper] Use Unicode Control Pictures
[VarDumper] inline dump() function loading
[Debug] No gc_collect_cycles(), it's costly and can segfault