SPU: improve TSX usage

Reduce transaction failure amount
Remove vm::try_to_lock

Utilities/mutex.h

@@ -100,6 +100,11 @@ public:
 	{
 		return (m_value.load() % c_one) != 0;
 	}
+
+	bool is_lockable() const
+	{
+		return m_value.load() >= c_min;
+	}
 };
 
 // Simplified shared (reader) lock implementation.

Utilities/types.h

@@ -992,9 +992,10 @@ constexpr FORCE_INLINE error_code::not_an_error not_an_error(const T& value)
 }
 
 // Synchronization helper (cache-friendly busy waiting)
-inline void busy_wait(std::size_t count = 100)
+inline void busy_wait(std::size_t cycles = 3000)
 {
-	while (count--) _mm_pause();
+	const u64 s = __rdtsc();
+	do _mm_pause(); while (__rdtsc() - s < cycles);
 }
 
 // Rotate helpers