Invoke CallToRuntime via Thread instead of ObjectPools.

runtime/vm/assembler_ia32.cc

Index: runtime/vm/assembler_ia32.cc
diff --git a/runtime/vm/assembler_ia32.cc b/runtime/vm/assembler_ia32.cc
index 2759cd2f51716ead718990981121924a90067516..b9e80d063e4a23f7c750ce6b8b28248333be5bf5 100644
--- a/runtime/vm/assembler_ia32.cc
+++ b/runtime/vm/assembler_ia32.cc
@@ -2645,6 +2645,12 @@ void Assembler::Call(const StubEntry& stub_entry) {
 }
 
 
+void Assembler::CallToRuntime() {
+  movl(CODE_REG, Address(THR, Thread::call_to_runtime_stub_offset()));
+  call(Address(THR, Thread::call_to_runtime_entry_point_offset()));
+}
+
+
 void Assembler::Jmp(const StubEntry& stub_entry) {
   const ExternalLabel label(stub_entry.EntryPoint());
   jmp(&label);