Remove unneeded extern crate, macro_use, and tidy uses.

crates/debug/src/write_debuginfo.rs

@@ -1,11 +1,9 @@
-use alloc::string::String;
-use alloc::vec::Vec;
-use gimli::write::{Address, Dwarf, EndianVec, Result, Sections, Writer};
-use gimli::{RunTimeEndian, SectionId};
-
+use alloc::{string::String, vec::Vec};
 use core::result;
 use faerie::artifact::{Decl, SectionKind};
 use faerie::*;
+use gimli::write::{Address, Dwarf, EndianVec, Result, Sections, Writer};
+use gimli::{RunTimeEndian, SectionId};
 
 #[derive(Clone)]
 struct DebugReloc {