rm cache_method from header

Author: JeffBezanson

src/julia_internal.h

@@ -667,12 +667,6 @@ JL_DLLEXPORT jl_code_instance_t *jl_get_method_inferred(
 jl_method_instance_t *jl_get_unspecialized(jl_method_t *def JL_PROPAGATES_ROOT);
 JL_DLLEXPORT void jl_read_codeinst_invoke(jl_code_instance_t *ci, uint8_t *specsigflags, jl_callptr_t *invoke, void **specptr, int waitcompile) JL_NOTSAFEPOINT;
 JL_DLLEXPORT jl_method_instance_t *jl_method_match_to_mi(jl_method_match_t *match, size_t world, size_t min_valid, size_t max_valid, int mt_cache);
-jl_method_instance_t *cache_method(
-        jl_methtable_t *mt, _Atomic(jl_typemap_t*) *cache, jl_value_t *parent JL_PROPAGATES_ROOT,
-        jl_tupletype_t *tt, // the original tupletype of the signature
-        jl_method_t *definition,
-        size_t world, size_t min_valid, size_t max_valid,
-        jl_svec_t *sparams);
 
 JL_DLLEXPORT jl_code_instance_t *jl_new_codeinst_uninit(jl_method_instance_t *mi, jl_value_t *owner);
 JL_DLLEXPORT jl_code_instance_t *jl_new_codeinst(