Add @(fast_math={...}) + intrinsics.Fast_Math_Flags

src/entity.cpp

@@ -256,6 +256,9 @@ struct Entity {
 			struct GenProcsData *gen_procs;
 			BlockingMutex gen_procs_mutex;
 			ProcedureOptimizationMode optimization_mode;
+
+			u64     fast_math_flags;
+
 			bool    is_foreign                 : 1;
 			bool    is_export                  : 1;
 			bool    generated_from_polymorphic : 1;