Allow rustc_mir_transform to register hook providers

compiler/rustc_mir_transform/src/lib.rs

@@ -37,8 +37,9 @@ use rustc_middle::mir::{
     LocalDecl, MirPass, MirPhase, Operand, Place, ProjectionElem, Promoted, RuntimePhase, Rvalue,
     SourceInfo, Statement, StatementKind, TerminatorKind, START_BLOCK,
 };
-use rustc_middle::query::Providers;
+use rustc_middle::query;
 use rustc_middle::ty::{self, TyCtxt, TypeVisitableExt};
+use rustc_middle::util::Providers;
 use rustc_span::{source_map::Spanned, sym, DUMMY_SP};
 use rustc_trait_selection::traits;
 
@@ -124,7 +125,7 @@ pub fn provide(providers: &mut Providers) {
     ffi_unwind_calls::provide(providers);
     shim::provide(providers);
     cross_crate_inline::provide(providers);
-    *providers = Providers {
+    providers.queries = query::Providers {
         mir_keys,
         mir_const,
         mir_const_qualif,
@@ -139,7 +140,7 @@ pub fn provide(providers: &mut Providers) {
         mir_inliner_callees: inline::cycle::mir_inliner_callees,
         promoted_mir,
         deduced_param_attrs: deduce_param_attrs::deduced_param_attrs,
-        ..*providers
+        ..providers.queries
     };
 }