restore kwcall_mt optimizations (#48672)

Deleted in cbfdb3f, probably by
accident. Refs #48670.

src/staticdata.c

@@ -98,7 +98,7 @@ extern "C" {
 // TODO: put WeakRefs on the weak_refs list during deserialization
 // TODO: handle finalizers
 
-#define NUM_TAGS    158
+#define NUM_TAGS    159
 
 // An array of references that need to be restored from the sysimg
 // This is a manually constructed dual of the gvars array, which would be produced by codegen for Julia code, for C.
@@ -241,6 +241,7 @@ jl_value_t **const*const get_tags(void) {
         INSERT_TAG(jl_typeinf_func);
         INSERT_TAG(jl_type_type_mt);
         INSERT_TAG(jl_nonfunction_mt);
+        INSERT_TAG(jl_kwcall_mt);
         INSERT_TAG(jl_kwcall_func);
 
         // some Core.Builtin Functions that we want to be able to reference:

test/keywordargs.jl

@@ -387,3 +387,10 @@ f41416(a...="a"; b=true) = (b, a)
 @test f41416(;b=false)   === (false, ("a",))
 @test f41416(33)         === (true, (33,))
 @test f41416(3; b=false) === (false, (3,))
+
+Core.kwcall(i::Int) = "hi $i"
+let m = first(methods(Core.kwcall, (Any,typeof(kwf1),Vararg)))
+    @test m.name === :kwf1
+    @test Core.kwcall(1) == "hi 1"
+    @test which(Core.kwcall, (Int,)).name === :kwcall
+end