Register all ExternalReferences in serializer code.

src/arm64/codegen-arm64.cc

Index: src/arm64/codegen-arm64.cc
===================================================================
--- src/arm64/codegen-arm64.cc	(revision 22763)
+++ src/arm64/codegen-arm64.cc	(working copy)
@@ -519,6 +519,9 @@
   ASSERT(!AreAliased(input, result,
                      double_temp1, double_temp2,
                      temp1, temp2, temp3));
+  // Serializer does not know how to encode references to math_exp_constants
+  // table. See ExternalReferenceTable::PopulateTable.
+  ASSERT(!masm->serializer_enabled());
   ASSERT(ExternalReference::math_exp_constants(0).address() != NULL);
 
   Label done;