Serializer: correctly deal with internal references.

src/assembler.h

Index: src/assembler.h
diff --git a/src/assembler.h b/src/assembler.h
index 9e6311dafd049e69c0e79ac867ecbf438241ebb5..b6351fae44d20f71c02b20804d4b760a28421326 100644
--- a/src/assembler.h
+++ b/src/assembler.h
@@ -578,9 +578,14 @@ class RelocInfo {
   // place, ready to be patched with the target.
   INLINE(int target_address_size());
 
+  // Read the reference in the instruction this relocation
+  // applies to; can only be called if rmode_ is EXTERNAL_REFERENCE.
+  INLINE(Address target_external_reference());
+
   // Read/modify the reference in the instruction this relocation
-  // applies to; can only be called if rmode_ is external_reference
-  INLINE(Address target_reference());
+  // applies to; can only be called if rmode_ is INTERNAL_REFERENCE.
+  INLINE(Address target_internal_reference());
+  INLINE(void set_target_internal_reference(Address target));
 
   // Read/modify the address of a call instruction. This is used to relocate
   // the break points where straight-line code is patched with a call