Use GetCodeFromTargetAddress everywhere, uniformly.

src/mark-compact.cc

Index: src/mark-compact.cc
===================================================================
--- src/mark-compact.cc	(revision 2887)
+++ src/mark-compact.cc	(working copy)
@@ -279,7 +279,7 @@
 
   void VisitCodeTarget(RelocInfo* rinfo) {
     ASSERT(RelocInfo::IsCodeTarget(rinfo->rmode()));
-    Code* code = CodeFromDerivedPointer(rinfo->target_address());
+    Code* code = Code::GetCodeFromTargetAddress(rinfo->target_address());
     if (FLAG_cleanup_ics_at_gc && code->is_inline_cache_stub()) {
       IC::Clear(rinfo->pc());
       // Please note targets for cleared inline cached do not have to be
@@ -289,7 +289,7 @@
     }
     if (IsCompacting()) {
       // When compacting we convert the target to a real object pointer.
-      code = CodeFromDerivedPointer(rinfo->target_address());
+      code = Code::GetCodeFromTargetAddress(rinfo->target_address());
       rinfo->set_target_object(code);
     }
   }
@@ -297,7 +297,7 @@
   void VisitDebugTarget(RelocInfo* rinfo) {
     ASSERT(RelocInfo::IsJSReturn(rinfo->rmode()) &&
            rinfo->IsCallInstruction());
-    HeapObject* code = CodeFromDerivedPointer(rinfo->call_address());
+    HeapObject* code = Code::GetCodeFromTargetAddress(rinfo->call_address());
     MarkCompactCollector::MarkObject(code);
     // When compacting we convert the call to a real object pointer.
     if (IsCompacting()) rinfo->set_call_object(code);
@@ -314,13 +314,6 @@
   // Tells whether the mark sweep collection will perform compaction.
   bool IsCompacting() { return MarkCompactCollector::IsCompacting(); }
 
-  // Retrieves the Code pointer from derived code entry.
-  Code* CodeFromDerivedPointer(Address addr) {
-    ASSERT(addr != NULL);
-    return reinterpret_cast<Code*>(
-        HeapObject::FromAddress(addr - Code::kHeaderSize));
-  }
-
   // Visit an unmarked object.
   void VisitUnmarkedObject(HeapObject* obj) {
 #ifdef DEBUG