Atomic inc and dec, the standard way

Try to use standard atomic instead of assembly code to do
atomic increment and decrement.

Signed-off-by: DaNiMoTh <jjdanimoth@gmail.com>

CMakeLists.txt

@@ -120,7 +120,7 @@ IF(COMPILE_PLUGIN)
 ENDIF(COMPILE_PLUGIN)
 
 # Compiler defaults flags for different profiles
-SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wnon-virtual-dtor -Woverloaded-virtual -pipe -fvisibility=hidden")
+SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wnon-virtual-dtor -Woverloaded-virtual -pipe -fvisibility=hidden -std=c++0x")
 SET(CMAKE_CXX_FLAGS_DEBUG "-g -O0 -DEXPENSIVE_DEBUG")
 SET(CMAKE_CXX_FLAGS_PROFILE "-g -pg -O2")
 SET(CMAKE_CXX_FLAGS_RELEASE "-O3 -DNDEBUG")

swftypes.h

@@ -34,6 +34,7 @@
 #include <assert.h>
 #include "exceptions.h"
 #include <arpa/inet.h>
+#include <stdatomic.h>
 
 namespace lightspark
 {
@@ -460,17 +461,6 @@ friend class ABCContext;
 	void destroyContents();
 };
 
-//Atomic operations: placeholders until C++0x is supported in GCC
-inline void atomic_increment(int* operand)
-{
-	__asm__ ("lock incl %0" : "+m" (*operand):);
-}
-
-inline void atomic_decrement(int* operand)
-{
-	__asm__ ("lock decl %0" : "+m" (*operand):);
-}
-
 class DLL_PUBLIC ASObject
 {
 friend class Manager;
@@ -487,7 +477,7 @@ CLASSBUILDABLE(ASObject);
 	virtual ~ASObject();
 	SWFOBJECT_TYPE type;
 private:
-	int32_t ref_count;
+	std::atomic<int32_t> ref_count;
 	Manager* manager;
 	int cur_level;
 	virtual int _maxlevel();
@@ -513,14 +503,14 @@ CLASSBUILDABLE(ASObject);
 	void incRef()
 	{
 		//std::cout << "incref " << this << std::endl;
-		atomic_increment(&ref_count);
+		ref_count.fetch_add(1);
 		assert(ref_count>0);
 	}
 	void decRef()
 	{
 		//std::cout << "decref " << this << std::endl;
 		assert_and_throw(ref_count>0);
-		atomic_decrement(&ref_count);
+		ref_count.fetch_sub(1);
 		if(ref_count==0)
 		{
 			if(manager)
@@ -538,7 +528,7 @@ CLASSBUILDABLE(ASObject);
 	}
 	void fake_decRef()
 	{
-		atomic_decrement(&ref_count);
+		ref_count.fetch_sub(1);
 	}
 	static void s_incRef(ASObject* o)
 	{