Add refcount on MemObj in blocked scenarios.

- Prevents destruction of MemObj while it may still be in use.
- Add UNRECOVERABLE to check whether object is deleted while having
dependencies, fix all problems is tests due to that fact.
- Fix special queue setting, clean interfaces.

Change-Id: I2a467e80df00ea1650decdcfa6866acf10b441f8

runtime/context/context.cpp

@@ -87,11 +87,12 @@ CommandQueue *Context::getSpecialQueue() {
 
 void Context::setSpecialQueue(CommandQueue *commandQueue) {
     specialQueue = commandQueue;
-    if (commandQueue) {
-        decRefInternal();
-    } else {
-        incRefInternal();
-    }
+}
+void Context::overrideSpecialQueueAndDecrementRefCount(CommandQueue *commandQueue) {
+    setSpecialQueue(commandQueue);
+    commandQueue->setIsSpecialCommandQueue(true);
+    //decrement ref count that special queue added
+    this->decRefInternal();
 };
 
 bool Context::isSpecialQueue(CommandQueue *commandQueue) {
@@ -179,8 +180,7 @@ bool Context::createImpl(const cl_context_properties *properties,
 
     auto commandQueue = CommandQueue::create(this, devices[0], nullptr, errcodeRet);
     DEBUG_BREAK_IF(commandQueue == nullptr);
-
-    setSpecialQueue(commandQueue);
+    overrideSpecialQueueAndDecrementRefCount(commandQueue);
 
     return true;
 }

runtime/context/context.h

@@ -92,6 +92,7 @@ class Context : public BaseObject<_cl_context> {
 
     CommandQueue *getSpecialQueue();
     void setSpecialQueue(CommandQueue *commandQueue);
+    void overrideSpecialQueueAndDecrementRefCount(CommandQueue *commandQueue);
     bool isSpecialQueue(CommandQueue *commandQueue);
     void deleteSpecialQueue();