AX: VoiceOver announces placeholder for a form field with set value and existing label.

• Component: Accessibility
• Status: NEW ---

[Yura Zenevich]

VoiceOver seems to be announcing placeholder attribute contents as form field 
description regardless of whether the name/value is set for an accessible 
object that represents the form field.

For example: in this snippet:

```data:text/html,<input aria-label="form field" type="text" value="test" placeholder="this placeholder should not be announced" />```

VO already announces "form field" as the name for the accessible object, and "test" as a value. Since there is no way to not include placeholder as description via VO verbosity settings, this version is too verbose.

[Radar WebKit Bug Importer]

<rdar://problem/84665355>