CPU/Recompiler: Implement fastmem

src/core/settings.h

@@ -76,6 +76,7 @@ struct Settings
   bool cpu_overclock_active = false;
   bool cpu_recompiler_memory_exceptions = false;
   bool cpu_recompiler_icache = false;
+  bool cpu_fastmem = true;
 
   float emulation_speed = 1.0f;
   bool speed_limiter_enabled = true;
@@ -179,6 +180,11 @@ struct Settings
     return gpu_pgxp_enable ? (gpu_pgxp_cpu ? PGXPMode::CPU : PGXPMode::Memory) : PGXPMode::Disabled;
   }
 
+  ALWAYS_INLINE bool IsUsingFastmem() const
+  {
+    return (cpu_fastmem && cpu_execution_mode == CPUExecutionMode::Recompiler && !cpu_recompiler_memory_exceptions);
+  }
+
   bool HasAnyPerGameMemoryCards() const;
 
   static void CPUOverclockPercentToFraction(u32 percent, u32* numerator, u32* denominator);