Disable some flags on threading tests that will break with --turbo-osr.

R=vogelheim@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1023753008

Cr-Commit-Position: refs/heads/master@{#27455}

test/cctest/test-thread-termination.cc

@@ -192,6 +192,7 @@ TEST(TerminateOnlyV8ThreadFromOtherThread) {
   // Run a loop that will be infinite if thread termination does not work.
   v8::Handle<v8::String> source = v8::String::NewFromUtf8(
       CcTest::isolate(), "try { loop(); fail(); } catch(e) { fail(); }");
+  i::FLAG_turbo_osr = false;  // TODO(titzer): interrupts in TF loops.
   v8::Script::Compile(source)->Run();
 
   thread.Join();
@@ -376,6 +377,7 @@ void MicrotaskLoopForever(const v8::FunctionCallbackInfo<v8::Value>& info) {
   // Enqueue another should-not-run task to ensure we clean out the queue
   // when we terminate.
   isolate->EnqueueMicrotask(v8::Function::New(isolate, MicrotaskShouldNotRun));
+  i::FLAG_turbo_osr = false;  // TODO(titzer): interrupts in TF loops.
   CompileRun("terminate(); while (true) { }");
   CHECK(v8::V8::IsExecutionTerminating());
 }