remove now unnecessary lang items

compiler/rustc_span/src/symbol.rs

@@ -494,11 +494,9 @@ symbols! {
         const_panic,
         const_panic_fmt,
         const_precise_live_drops,
-        const_ptr,
         const_raw_ptr_deref,
         const_raw_ptr_to_usize_cast,
         const_refs_to_cell,
-        const_slice_ptr,
         const_trait_bound_opt_out,
         const_trait_impl,
         const_transmute,
@@ -655,9 +653,7 @@ symbols! {
         f,
         f16c_target_feature,
         f32,
-        f32_runtime,
         f64,
-        f64_runtime,
         fabsf32,
         fabsf64,
         fadd_fast,
@@ -913,8 +909,6 @@ symbols! {
         mul_with_overflow,
         must_not_suspend,
         must_use,
-        mut_ptr,
-        mut_slice_ptr,
         naked,
         naked_functions,
         name,
@@ -1314,11 +1308,8 @@ symbols! {
         sized,
         skip,
         slice,
-        slice_alloc,
         slice_len_fn,
         slice_patterns,
-        slice_u8,
-        slice_u8_alloc,
         slicing_syntax,
         soft,
         specialization,
@@ -1348,7 +1339,6 @@ symbols! {
         stop_after_dataflow,
         store,
         str,
-        str_alloc,
         str_split_whitespace,
         str_trim,
         str_trim_end,