Move deopt_id and related helpers/definitions from Isolate to Thread

runtime/vm/intermediate_language_arm.cc

Index: runtime/vm/intermediate_language_arm.cc
diff --git a/runtime/vm/intermediate_language_arm.cc b/runtime/vm/intermediate_language_arm.cc
index 06f3988208f34eb2d517a5903c0c695df63b68f6..f7030f816e34103c9e65b80b81132655f5c1055a 100644
--- a/runtime/vm/intermediate_language_arm.cc
+++ b/runtime/vm/intermediate_language_arm.cc
@@ -233,7 +233,7 @@ void ClosureCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   compiler->RecordSafepoint(locs());
   // Marks either the continuation point in unoptimized code or the
   // deoptimization point in optimized code, after call.
-  const intptr_t deopt_id_after = Isolate::ToDeoptAfter(deopt_id());
+  const intptr_t deopt_id_after = Thread::ToDeoptAfter(deopt_id());
   if (compiler->is_optimizing()) {
     compiler->AddDeoptIndexAtCall(deopt_id_after, token_pos());
   }