Color EBB arguments.

When coloring registers for a branch instruction, also make sure that
the values passed as EBB arguments are in the registers expected by the
EBB.

The first time a branch to an EBB is processed, assign the EBB arguments
to the registers where the branch arguments already reside so no
regmoves are needed.

lib/cretonne/src/regalloc/context.rs

@@ -119,12 +119,7 @@ impl Context {
 
         // Pass: Coloring.
         self.coloring
-            .run(isa,
-                 func,
-                 domtree,
-                 &mut self.liveness,
-                 &mut self.topo,
-                 &mut self.tracker);
+            .run(isa, func, domtree, &mut self.liveness, &mut self.tracker);
 
         if isa.flags().enable_verifier() {
             verify_context(func, cfg, domtree, Some(isa))?;