Remove putDirectVirtual

Reviewed by Sam Weinig.

This could most generously be described as 'vestigial'.
No performance impact.

* API/JSObjectRef.cpp:
(JSObjectSetProperty):
    - changed to use defineOwnProperty
* debugger/DebuggerActivation.cpp:
* debugger/DebuggerActivation.h:
    - remove putDirectVirtual
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
    - changed to use defineOwnProperty
* runtime/ClassInfo.h:
* runtime/JSActivation.cpp:
* runtime/JSActivation.h:
* runtime/JSCell.cpp:
* runtime/JSCell.h:
* runtime/JSGlobalObject.cpp:
* runtime/JSGlobalObject.h:
* runtime/JSObject.cpp:
* runtime/JSObject.h:
* runtime/JSProxy.cpp:
* runtime/JSProxy.h:
* runtime/JSSymbolTableObject.cpp:
* runtime/JSSymbolTableObject.h:
    - remove putDirectVirtual
* runtime/PropertyDescriptor.h:
(JSC::PropertyDescriptor::PropertyDescriptor):
    - added constructor for convenience



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154459 268f45cc-cd09-0410-ab3c-d52691b4dbfc