[Process] Reduce I/O load on Windows platform
bug #11120 [2.3][Process] Reduce I/O load on Windows platform (romainneutron)

This PR was merged into the 2.3 branch.

Discussion
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[2.3][Process] Reduce I/O load on Windows platform

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

When using file handles, no `stream_select` call is done.
On linux platforms, `stream_select` introduce a sleep as it has 0.2s timeout, there is no such pause on Windows, producing lot's of disk I/Os when reading file handles

Commits
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ff0bb01 [Process] Reduce I/O load on Windows platform
Merge branch '2.3' into 2.4

* 2.3:
  [Translator] Use quote to surround invalid locale
  Optimize assertLocale regexp
  [Validator] Backported #11410 to 2.3: Object initializers are called only once per object
  [Translator][FrameworkBundle] Added @ to the list of allowed chars in Translator
  [Process] Reduce I/O load on Windows platform
  [Form] Check if IntlDateFormatter constructor returned a valid object before using it
Merge branch '2.4' into 2.5

* 2.4:
  [Translator] Use quote to surround invalid locale
  Optimize assertLocale regexp
  [ExpressionLanguage] Fixed an issue with # characters in double quoted string literals
  Add some tweaks to the pt_BR translations
  [Validator] Backported #11410 to 2.3: Object initializers are called only once per object
  [Translator][FrameworkBundle] Added @ to the list of allowed chars in Translator
  [Process] Reduce I/O load on Windows platform
  [Form] Check if IntlDateFormatter constructor returned a valid object before using it

Conflicts:
	src/Symfony/Component/Validator/Tests/ValidationVisitorTest.php
Merge branch '2.5'

* 2.5:
  [Translator] Use quote to surround invalid locale
  [Validator] Fixed memory leak in ValidatorBuilder
  [FrameworkBundle] changed KernelTestCase::getKernelClass() to check $_SERVER['KERNEL_DIR'] before invoking getPhpUnitXmlDir()
  Optimize assertLocale regexp
  [ExpressionLanguage] Fixed an issue with # characters in double quoted string literals
  [Validator] Fixed object initializers in 2.5 version of the Validator
  Add some tweaks to the pt_BR translations
  [Validator] Backported #11410 to 2.3: Object initializers are called only once per object
  [Translator][FrameworkBundle] Added @ to the list of allowed chars in Translator
  [Process] Reduce I/O load on Windows platform
  [Form] Check if IntlDateFormatter constructor returned a valid object before using it

Conflicts:
	src/Symfony/Component/Process/ProcessPipes.php