Move deopt_id and related helpers/definitions from Isolate to Thread

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
diff --git a/runtime/vm/intermediate_language_mips.cc b/runtime/vm/intermediate_language_mips.cc
index e381157f3a995b98cecc9647d3c430bfebc5f310..8c07b90e647fa1bb60f43277ae5a5696f284150f 100644
--- a/runtime/vm/intermediate_language_mips.cc
+++ b/runtime/vm/intermediate_language_mips.cc
@@ -279,7 +279,7 @@ 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());
   }