Minor cleanup: use handle when setting instructions in code object.

runtime/vm/precompiler.cc

Index: runtime/vm/precompiler.cc
diff --git a/runtime/vm/precompiler.cc b/runtime/vm/precompiler.cc
index 388db1a265d76e4a1c5ba5301f220d26104c7a7a..22348eb43e4b6340e755c19115f1bbbfc7ab70ce 100644
--- a/runtime/vm/precompiler.cc
+++ b/runtime/vm/precompiler.cc
@@ -2342,8 +2342,8 @@ void Precompiler::DedupInstructions() {
       code_ = function.CurrentCode();
       instructions_ = code_.instructions();
       instructions_ = DedupOneInstructions(instructions_);
-      code_.SetActiveInstructions(instructions_.raw());
-      code_.set_instructions(instructions_.raw());
+      code_.SetActiveInstructions(instructions_);
+      code_.set_instructions(instructions_);
       function.SetInstructions(code_);  // Update cached entry point.
     }