rustc_codegen_llvm: use safe references for Type.

src/librustc_codegen_llvm/debuginfo/utils.rs

@@ -49,8 +49,7 @@ pub fn span_start(cx: &CodegenCx, span: Span) -> syntax_pos::Loc {
 }
 
 #[inline]
-pub fn debug_context<'a, 'tcx>(cx: &'a CodegenCx<'a, 'tcx>)
-                           -> &'a CrateDebugContext<'a, 'tcx> {
+pub fn debug_context(cx: &'a CodegenCx<'ll, 'tcx>) -> &'a CrateDebugContext<'a, 'tcx> {
     cx.dbg_cx.as_ref().unwrap()
 }