Don't assign safepoint at the definition to the definition's live-range.

runtime/vm/code_generator.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/code_generator.h"
 
 #include "vm/assembler.h"
 #include "vm/ast.h"
 #include "vm/bigint_operations.h"
 #include "vm/code_patcher.h"
@@ skipping 52 matching lines @@
 
 DEFINE_FLAG(int, stacktrace_every, 0,
             "Compute debugger stacktrace on every N stack overflow checks");
 DEFINE_FLAG(charp, stacktrace_filter, NULL,
             "Compute stacktrace in named function on stack overflow checks");
 DEFINE_FLAG(int, deoptimize_every, 0,
             "Deoptimize on every N stack overflow checks");
 DEFINE_FLAG(charp, deoptimize_filter, NULL,
             "Deoptimize in named function on stack overflow checks");
 
+#ifdef DEBUG
+DEFINE_FLAG(charp, gc_at_instance_allocation, NULL,
+            "Perform a GC before allocation of instances of "
+            "the specified class");
+#endif
 
 DEFINE_RUNTIME_ENTRY(TraceFunctionEntry, 1) {
   const Function& function = Function::CheckedHandle(arguments.ArgAt(0));
   const String& function_name = String::Handle(function.name());
   const String& class_name =
       String::Handle(Class::Handle(function.Owner()).Name());
   OS::PrintErr("> Entering '%s.%s'\n",
       class_name.ToCString(), function_name.ToCString());
 }
 
@@ skipping 51 matching lines @@
   return caller_frame->GetTokenPos();
 }
 
 
 // Allocate a new object.
 // Arg0: class of the object that needs to be allocated.
 // Arg1: type arguments of the object that needs to be allocated.
 // Return value: newly allocated object.
 DEFINE_RUNTIME_ENTRY(AllocateObject, 2) {
   const Class& cls = Class::CheckedHandle(arguments.ArgAt(0));
+
+#ifdef DEBUG
+  if (FLAG_gc_at_instance_allocation != NULL) {
+    const String& name = String::Handle(cls.Name());
+    if (String::EqualsIgnoringPrivateKey(
+            name,
+            String::Handle(String::New(FLAG_gc_at_instance_allocation)))) {
+      Isolate::Current()->heap()->CollectAllGarbage();
+    }
+  }
+#endif
+
   const Instance& instance = Instance::Handle(Instance::New(cls));
+
   arguments.SetReturn(instance);
   if (cls.NumTypeArguments() == 0) {
     // No type arguments required for a non-parameterized type.
     ASSERT(Instance::CheckedHandle(arguments.ArgAt(1)).IsNull());
     return;
   }
   TypeArguments& type_arguments =
       TypeArguments::CheckedHandle(arguments.ArgAt(1));
   // Unless null (for a raw type), the type argument vector may be longer than
   // necessary due to a type optimization reusing the type argument vector of
@@ skipping 1372 matching lines @@
 // of the given value.
 //   Arg0: Field object;
 //   Arg1: Value that is being stored.
 DEFINE_RUNTIME_ENTRY(UpdateFieldCid, 2) {
   const Field& field = Field::CheckedHandle(arguments.ArgAt(0));
   const Object& value = Object::Handle(arguments.ArgAt(1));
   field.RecordStore(value);
 }
 
 }  // namespace dart