Build transactions at runtime

Drop _xbegin family intrinsics due to bad codegen
Implemented `notifier` class, replacing vm::notify
Minor optimization: detach transactions from global mutex on TSX path
Minor optimization: don't acquire vm::passive_lock on PPU on TSX path

rpcs3/Emu/System.cpp

@@ -23,6 +23,7 @@
 #include "Loader/ELF.h"
 
 #include "Utilities/StrUtil.h"
+#include "Utilities/sysinfo.h"
 
 #include "../Crypto/unself.h"
 #include "../Crypto/unpkg.h"
@@ -40,6 +41,8 @@
 
 cfg_root g_cfg;
 
+bool g_use_rtm = utils::has_rtm();
+
 std::string g_cfg_defaults;
 
 extern atomic_t<u32> g_thread_count;