Implement safepointing of threads

runtime/vm/compiler_test.cc

Index: runtime/vm/compiler_test.cc
diff --git a/runtime/vm/compiler_test.cc b/runtime/vm/compiler_test.cc
index cab15939c33e2e5112f97713103485095de6d9a7..7655f7d73248f701df296a93c686453d9ad91639 100644
--- a/runtime/vm/compiler_test.cc
+++ b/runtime/vm/compiler_test.cc
@@ -8,9 +8,9 @@
 #include "vm/compiler.h"
 #include "vm/dart_api_impl.h"
 #include "vm/object.h"
+#include "vm/safepoint.h"
 #include "vm/symbols.h"
 #include "vm/thread_pool.h"
-#include "vm/thread_registry.h"
 #include "vm/unit_test.h"
 
 namespace dart {
@@ -73,7 +73,7 @@ TEST_CASE(CompileFunction) {
 }
 
 
-TEST_CASE(CompileFunctionOnHelperThread) {
+VM_TEST_CASE(CompileFunctionOnHelperThread) {
   // Create a simple function and compile it without optimization.
   const char* kScriptChars =
             "class A {\n"
@@ -106,8 +106,7 @@ TEST_CASE(CompileFunctionOnHelperThread) {
   Monitor* m = new Monitor();
   MonitorLocker ml(m);
   while (!func.HasOptimizedCode()) {
-    Isolate::Current()->thread_registry()->CheckSafepoint();
-    ml.Wait(1);
+    ml.WaitWithSafepointCheck(thread, 1);
   }
   BackgroundCompiler::Stop(isolate->background_compiler());
 }
@@ -184,7 +183,7 @@ TEST_CASE(EvalExpression) {
 }
 
 
-TEST_CASE(EvalExpressionWithLazyCompile) {
+VM_TEST_CASE(EvalExpressionWithLazyCompile) {
   Library& lib = Library::Handle(Library::CoreLibrary());
 
   const String& expression = String::Handle(String::New(