Avoid creating duplicate defs

Author: camelid

compiler/rustc_ast_lowering/src/asm.rs

@@ -15,7 +15,6 @@ use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap};
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
 use rustc_session::parse::feature_err;
-use rustc_span::symbol::kw;
 use rustc_span::{sym, Span};
 use rustc_target::asm;
 use std::collections::hash_map::Entry;
@@ -222,15 +221,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                             };
 
                             // Wrap the expression in an AnonConst.
-                            let parent_def_id = self.current_hir_id_owner;
                             let node_id = self.next_node_id();
-                            self.create_def(
-                                parent_def_id.def_id,
-                                node_id,
-                                kw::Empty,
-                                DefKind::AnonConst,
-                                *op_sp,
-                            );
                             let anon_const = AnonConst { id: node_id, value: P(expr) };
                             hir::InlineAsmOperand::SymFn {
                                 anon_const: self.lower_anon_const(&anon_const),