Move DefLocation from rustc_codegen_ssa to rustc_middle

compiler/rustc_codegen_ssa/src/mir/analyze.rs

@@ -8,7 +8,7 @@ use rustc_index::bit_set::BitSet;
 use rustc_index::{IndexSlice, IndexVec};
 use rustc_middle::mir::traversal;
 use rustc_middle::mir::visit::{MutatingUseContext, NonMutatingUseContext, PlaceContext, Visitor};
-use rustc_middle::mir::{self, Location, TerminatorKind};
+use rustc_middle::mir::{self, DefLocation, Location, TerminatorKind};
 use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf};
 
 pub fn non_ssa_locals<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
@@ -67,21 +67,6 @@ enum LocalKind {
     SSA(DefLocation),
 }
 
-#[derive(Copy, Clone, PartialEq, Eq)]
-enum DefLocation {
-    Argument,
-    Body(Location),
-}
-
-impl DefLocation {
-    fn dominates(self, location: Location, dominators: &Dominators<mir::BasicBlock>) -> bool {
-        match self {
-            DefLocation::Argument => true,
-            DefLocation::Body(def) => def.successor_within_block().dominates(location, dominators),
-        }
-    }
-}
-
 struct LocalAnalyzer<'mir, 'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> {
     fx: &'mir FunctionCx<'a, 'tcx, Bx>,
     dominators: &'mir Dominators<mir::BasicBlock>,

compiler/rustc_middle/src/mir/mod.rs

@@ -1590,6 +1590,23 @@ impl Location {
     }
 }
 
+/// `DefLocation` represents the location of a definition - either an argument or an assignment
+/// within MIR body.
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub enum DefLocation {
+    Argument,
+    Body(Location),
+}
+
+impl DefLocation {
+    pub fn dominates(self, location: Location, dominators: &Dominators<BasicBlock>) -> bool {
+        match self {
+            DefLocation::Argument => true,
+            DefLocation::Body(def) => def.successor_within_block().dominates(location, dominators),
+        }
+    }
+}
+
 // Some nodes are used a lot. Make sure they don't unintentionally get bigger.
 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 mod size_asserts {