merge core_panic feature into panic_internals

library/core/src/lib.rs

@@ -168,7 +168,6 @@
 #![feature(const_unicode_case_lookup)]
 #![feature(const_unsafecell_get_mut)]
 #![feature(const_waker)]
-#![feature(core_panic)]
 #![feature(coverage_attribute)]
 #![feature(duration_consts_float)]
 #![feature(internal_impls_macro)]
@@ -180,6 +179,7 @@
 #![feature(non_null_convenience)]
 #![feature(offset_of)]
 #![feature(offset_of_enum)]
+#![feature(panic_internals)]
 #![feature(ptr_alignment_type)]
 #![feature(ptr_metadata)]
 #![feature(set_ptr_value)]