Make Ptr values static-show w/ type-information (#58584)

Small follow-up to #58512

(cherry picked from commit 36bd3ad)

Author: topolarity

src/rtutils.c

@@ -1062,13 +1062,6 @@ static size_t jl_static_show_x_(JL_STREAM *out, jl_value_t *v, jl_datatype_t *vt
     else if (vt == jl_uint8_type) {
         n += jl_printf(out, "0x%02" PRIx8, *(uint8_t*)v);
     }
-    else if (jl_pointer_type && jl_is_cpointer_type((jl_value_t*)vt)) {
-#ifdef _P64
-        n += jl_printf(out, "0x%016" PRIx64, *(uint64_t*)v);
-#else
-        n += jl_printf(out, "0x%08" PRIx32, *(uint32_t*)v);
-#endif
-    }
     else if (vt == jl_float16_type) {
         n += jl_static_show_float(out, julia_half_to_float(*(uint16_t *)v), vt);
     }

test/show.jl

@@ -1595,6 +1595,9 @@ struct var"%X%" end  # Invalid name without '#'
             Float16(1e4),                1f8,                         1e17,
             Float16(-1e4),               -1f8,                        -1e17,
 
+            # Pointers should round-trip
+            Ptr{Cvoid}(0), Ptr{Cvoid}(typemax(UInt)), Ptr{Any}(0), Ptr{Any}(typemax(UInt)),
+
             # :var"" escaping rules differ from strings (#58484)
             :foo,
             :var"bar baz",