remove bit_set re-export from rustc_data_structures

src/librustc_codegen_llvm/Cargo.toml

@@ -12,6 +12,7 @@ test = false
 
 [dependencies]
 rustc_llvm = { path = "../librustc_llvm" }
+rustc_index = { path = "../librustc_index" }
 
 [features]
 # This is used to convince Cargo to separately cache builds of `rustc_codegen_llvm`

src/librustc_codegen_llvm/debuginfo/create_scope_map.rs

@@ -11,7 +11,7 @@ use libc::c_uint;
 
 use syntax_pos::Pos;
 
-use rustc_data_structures::bit_set::BitSet;
+use rustc_index::bit_set::BitSet;
 use rustc_data_structures::indexed_vec::{Idx, IndexVec};
 
 use syntax_pos::BytePos;