Version 3.1.3....

src/x64/assembler-x64.cc

Index: src/x64/assembler-x64.cc
===================================================================
--- src/x64/assembler-x64.cc	(revision 6703)
+++ src/x64/assembler-x64.cc	(working copy)
@@ -1188,6 +1188,16 @@
 }
 
 
+void Assembler::imull(Register dst, const Operand& src) {
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  emit_optional_rex_32(dst, src);
+  emit(0x0F);
+  emit(0xAF);
+  emit_operand(dst, src);
+}
+
+
 void Assembler::imull(Register dst, Register src, Immediate imm) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
@@ -3076,10 +3086,15 @@
 void Assembler::RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data) {
   ASSERT(rmode != RelocInfo::NONE);
   // Don't record external references unless the heap will be serialized.
-  if (rmode == RelocInfo::EXTERNAL_REFERENCE &&
-      !Serializer::enabled() &&
-      !FLAG_debug_code) {
-    return;
+  if (rmode == RelocInfo::EXTERNAL_REFERENCE) {
+#ifdef DEBUG
+    if (!Serializer::enabled()) {
+      Serializer::TooLateToEnableNow();
+    }
+#endif
+    if (!Serializer::enabled() && !FLAG_debug_code) {
+      return;
+    }
   }
   RelocInfo rinfo(pc_, rmode, data);
   reloc_info_writer.Write(&rinfo);