Remove remaining poisoning code.

Remove remaining poisoning code.
https://bugs.webkit.org/show_bug.cgi?id=194138

Reviewed by Saam Barati.

Source/WTF:

This patch removes the instantiation of Poisoned variants of the various containers
but retains the ability of those containers to work with pointer traits.  This
allows us to use them with smart pointers in the future (just like we used to with
Poisoned values).  At minimum, this ability will be useful when we want to insert
an observer into the container storage type for debugging purposes, or to collect
statistics for profiling.

* WTF.xcodeproj/project.pbxproj:
* wtf/Bag.h:
* wtf/CMakeLists.txt:
* wtf/Platform.h:
* wtf/Poisoned.cpp: Removed.
* wtf/Poisoned.h: Removed.
* wtf/PoisonedUniquePtr.h: Removed.
* wtf/Ref.h:
* wtf/RefCountedArray.h:
* wtf/RefPtr.h:
* wtf/WTFAssertions.cpp:

Tools:

* TestWebKitAPI/CMakeLists.txt:
* TestWebKitAPI/TestWebKitAPI.xcodeproj/project.pbxproj:
* TestWebKitAPI/Tests/WTF/Poisoned.cpp: Removed.
* TestWebKitAPI/Tests/WTF/PoisonedRef.cpp: Removed.
* TestWebKitAPI/Tests/WTF/PoisonedRefPtr.cpp: Removed.
* TestWebKitAPI/Tests/WTF/PoisonedUniquePtr.cpp: Removed.
* TestWebKitAPI/Tests/WTF/PoisonedUniquePtrForNonTriviallyDestructibleArrays.cpp: Removed.
* TestWebKitAPI/Tests/WTF/PoisonedUniquePtrForTriviallyDestructibleArrays.cpp: Removed.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@242127 268f45cc-cd09-0410-ab3c-d52691b4dbfc