Reverting 3174. Aka reapplying 3150, 3151 and 3159. Aka api accessor

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index 34595f83ff4257510eccd7a8f815e61777333b8e..34346a9105d3377ce3fe6c1f2dc558f20d24cea9 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -522,6 +522,10 @@ ExternalReference::ExternalReference(Builtins::CFunctionId id)
   : address_(Redirect(Builtins::c_function_address(id))) {}
 
 
+ExternalReference::ExternalReference(ApiFunction* fun)
+  : address_(Redirect(fun->address())) {}
+
+
 ExternalReference::ExternalReference(Builtins::Name name)
   : address_(Builtins::builtin_address(name)) {}
 
@@ -608,6 +612,27 @@ ExternalReference ExternalReference::new_space_allocation_limit_address() {
   return ExternalReference(Heap::NewSpaceAllocationLimitAddress());
 }
 
+
+ExternalReference ExternalReference::handle_scope_extensions_address() {
+  return ExternalReference(HandleScope::current_extensions_address());
+}
+
+
+ExternalReference ExternalReference::handle_scope_next_address() {
+  return ExternalReference(HandleScope::current_next_address());
+}
+
+
+ExternalReference ExternalReference::handle_scope_limit_address() {
+  return ExternalReference(HandleScope::current_limit_address());
+}
+
+
+ExternalReference ExternalReference::scheduled_exception_address() {
+  return ExternalReference(Top::scheduled_exception_address());
+}
+
+
 #ifdef V8_NATIVE_REGEXP
 
 ExternalReference ExternalReference::re_check_stack_guard_state() {