Remove HIR liveness pass

Author: ecstatic-morse

src/librustc_middle/query/mod.rs

@@ -430,10 +430,6 @@ rustc_queries! {
             desc { |tcx| "checking intrinsics in {}", describe_as_module(key, tcx) }
         }
 
-        query check_mod_liveness(key: DefId) -> () {
-            desc { |tcx| "checking liveness of variables in {}", describe_as_module(key, tcx) }
-        }
-
         query check_mod_impl_wf(key: DefId) -> () {
             desc { |tcx| "checking that impls are well-formed in {}", describe_as_module(key, tcx) }
         }

src/librustc_passes/lib.rs

@@ -28,7 +28,6 @@ mod intrinsicck;
 mod lang_items;
 pub mod layout_test;
 mod lib_features;
-mod liveness;
 pub mod loops;
 mod reachable;
 mod region;
@@ -44,7 +43,6 @@ pub fn provide(providers: &mut Providers<'_>) {
     lang_items::provide(providers);
     lib_features::provide(providers);
     loops::provide(providers);
-    liveness::provide(providers);
     intrinsicck::provide(providers);
     reachable::provide(providers);
     region::provide(providers);