Waiters should be notified when a waitee is killed.

Ran into a horrendous bug where VirtualConsole would overrun its buffer
and scribble right into some other object if we were interrupted while
processing a character. Slapped an InterruptDisabler onto onChar for now.

This provokes an interesting question though.. if a process is killed
while its in kernel space, how the heck do we release any locks it held?
I'm sure there are many different solutions to this problem, but I'll
have to think about it.

VirtualFileSystem/VirtualFileSystem.cpp

@@ -558,11 +558,13 @@ InodeIdentifier VirtualFileSystem::resolvePath(const String& path, int& error, I
 
 void VirtualFileSystem::Node::retain()
 {
+    InterruptDisabler disabler; // FIXME: Make a Retainable with atomic retain count instead.
     ++retainCount;
 }
 
 void VirtualFileSystem::Node::release()
 {
+    InterruptDisabler disabler; // FIXME: Make a Retainable with atomic retain count instead.
     ASSERT(retainCount);
     if (--retainCount == 0) {
         m_vfs->freeNode(this);