Regalloc: remove the transient LiveRangeContext data structure;

cranelift/codegen/src/regalloc/liveness.rs

@@ -181,7 +181,7 @@ use crate::ir::dfg::ValueDef;
 use crate::ir::{Ebb, Function, Inst, Layout, ProgramPoint, Value};
 use crate::isa::{EncInfo, OperandConstraint, TargetIsa};
 use crate::regalloc::affinity::Affinity;
-use crate::regalloc::liverange::{LiveRange, LiveRangeContext, LiveRangeForest};
+use crate::regalloc::liverange::{LiveRange, LiveRangeForest};
 use crate::timing;
 use core::mem;
 use core::ops::Index;
@@ -314,16 +314,16 @@ impl Liveness {
         }
     }
 
+    /// Current forest storage.
+    pub fn forest(&self) -> &LiveRangeForest {
+        &self.forest
+    }
+
     /// Current live ranges.
     pub fn ranges(&self) -> &LiveRangeSet {
         &self.ranges
     }
 
-    /// Get a context needed for working with a `LiveRange`.
-    pub fn context<'a>(&'a self, layout: &'a Layout) -> LiveRangeContext<'a, Layout> {
-        LiveRangeContext::new(layout, &self.forest)
-    }
-
     /// Clear all data structures in this liveness analysis.
     pub fn clear(&mut self) {
         self.ranges.clear();