Implement safepointing of threads

runtime/vm/intermediate_language_ia32.cc

Index: runtime/vm/intermediate_language_ia32.cc
diff --git a/runtime/vm/intermediate_language_ia32.cc b/runtime/vm/intermediate_language_ia32.cc
index 3ceb83c939f4c96311eecbf8a91a56405e56baa2..4890d41e59d2b3f915890af567504bca74712924 100644
--- a/runtime/vm/intermediate_language_ia32.cc
+++ b/runtime/vm/intermediate_language_ia32.cc
@@ -820,8 +820,6 @@ void NativeCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   SetupNative();
   Register result = locs()->out(0).reg();
   const intptr_t argc_tag = NativeArguments::ComputeArgcTag(function());
-  const bool is_leaf_call =
-      (argc_tag & NativeArguments::AutoSetupScopeMask()) == 0;
 
   // Push the result place holder initialized to NULL.
   __ PushObject(Object::null_object());
@@ -839,7 +837,7 @@ void NativeCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
     stub_entry = StubCode::CallBootstrapCFunction_entry();
     __ movl(ECX, Immediate(NativeEntry::LinkNativeCallEntry()));
   } else {
-    stub_entry = (is_bootstrap_native() || is_leaf_call) ?
+    stub_entry = (is_bootstrap_native()) ?
         StubCode::CallBootstrapCFunction_entry() :
         StubCode::CallNativeCFunction_entry();
     const ExternalLabel label(reinterpret_cast<uword>(native_c_function()));