add julia half functions to header

Author: KristofferC

src/julia_internal.h

@@ -1439,6 +1439,10 @@ JL_DLLEXPORT jl_array_t *jl_array_copy(jl_array_t *ary);
 JL_DLLEXPORT uintptr_t jl_object_id_(uintptr_t tv, jl_value_t *v) JL_NOTSAFEPOINT;
 JL_DLLEXPORT void jl_set_next_task(jl_task_t *task) JL_NOTSAFEPOINT;
 
+JL_DLLEXPORT uint16_t julia_double_to_half(double param) JL_NOTSAFEPOINT;
+JL_DLLEXPORT uint16_t julia_float_to_half(float param) JL_NOTSAFEPOINT;
+JL_DLLEXPORT float julia_half_to_float(uint16_t param) JL_NOTSAFEPOINT;
+
 // -- synchronization utilities -- //
 
 extern jl_mutex_t typecache_lock;