Move deopt_id and related helpers/definitions from Isolate to Thread

runtime/vm/intermediate_language_x64.cc

Index: runtime/vm/intermediate_language_x64.cc
diff --git a/runtime/vm/intermediate_language_x64.cc b/runtime/vm/intermediate_language_x64.cc
index ea5e6857b19fb72419657374546e17e9493cdef0..cc1967501c1f76fd2e0159cacafc80d4ca2f7e80 100644
--- a/runtime/vm/intermediate_language_x64.cc
+++ b/runtime/vm/intermediate_language_x64.cc
@@ -6364,7 +6364,7 @@ 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());
   }
@@ -6422,7 +6422,7 @@ void AllocateObjectInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 void DebugStepCheckInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(!compiler->is_optimizing());
   __ CallPatchable(*StubCode::DebugStepCheck_entry());
-  compiler->AddCurrentDescriptor(stub_kind_, Isolate::kNoDeoptId, token_pos());
+  compiler->AddCurrentDescriptor(stub_kind_, Thread::kNoDeoptId, token_pos());
   compiler->RecordSafepoint(locs());
 }