https://bugs.webkit.org/show_bug.cgi?id=67755

Reviewed by Gavin Barraclough.

../JavaScriptCore: 

- Removes the Completion object and replaces its use with out parameter exceptions.
- Remove ComplType and virtual exceptionType() function on JSObject. Replace with
  ClassInfo for InterruptedExecutionError and TerminatedExecutionError.

* API/JSBase.cpp:
(JSEvaluateScript):
(JSCheckScriptSyntax):
* JavaScriptCore.exp:
* JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCore.def:
* interpreter/Interpreter.cpp:
(JSC::Interpreter::throwException):
* jsc.cpp:
(functionLoad):
(functionCheckSyntax):
(runWithScripts):
(runInteractive):
* runtime/Completion.cpp:
(JSC::checkSyntax):
(JSC::evaluate):
* runtime/Completion.h:
* runtime/ExceptionHelpers.cpp:
(JSC::InterruptedExecutionError::toString):
(JSC::TerminatedExecutionError::toString):
(JSC::createInterruptedExecutionException):
* runtime/ExceptionHelpers.h:
(JSC::InterruptedExecutionError::InterruptedEx...