Eliminate unnecessary depencencies in some header files....

src/register-allocator-inl.h

Index: src/register-allocator-inl.h
===================================================================
--- src/register-allocator-inl.h	(revision 3815)
+++ src/register-allocator-inl.h	(working copy)
@@ -48,6 +48,20 @@
 namespace v8 {
 namespace internal {
 
+Result::Result(const Result& other) {
+  other.CopyTo(this);
+}
+
+
+Result& Result::operator=(const Result& other) {
+  if (this != &other) {
+    Unuse();
+    other.CopyTo(this);
+  }
+  return *this;
+}
+
+
 Result::~Result() {
   if (is_register()) {
     CodeGeneratorScope::Current()->allocator()->Unuse(reg());
@@ -71,6 +85,25 @@
 }
 
 
+bool RegisterAllocator::is_used(Register reg) {
+  return registers_.is_used(ToNumber(reg));
+}
+
+
+int RegisterAllocator::count(Register reg) {
+  return registers_.count(ToNumber(reg));
+}
+
+
+void RegisterAllocator::Use(Register reg) {
+  registers_.Use(ToNumber(reg));
+}
+
+
+void RegisterAllocator::Unuse(Register reg) {
+  registers_.Unuse(ToNumber(reg));
+}
+
 } }  // namespace v8::internal
 
 #endif  // V8_REGISTER_ALLOCATOR_INL_H_