Disentangle assembler from isolate.

src/snapshot/serializer.cc

Index: src/snapshot/serializer.cc
diff --git a/src/snapshot/serializer.cc b/src/snapshot/serializer.cc
index d99ca2ab306230e74fc980c662e129b9bccb510a..025283b7b33ee0a20bf1b9800d31d2804ac86db4 100644
--- a/src/snapshot/serializer.cc
+++ b/src/snapshot/serializer.cc
@@ -747,7 +747,7 @@ Address Serializer::ObjectSerializer::PrepareCode() {
                     RelocInfo::ModeMask(RelocInfo::INTERNAL_REFERENCE_ENCODED);
     for (RelocIterator it(code, mode_mask); !it.done(); it.next()) {
       RelocInfo* rinfo = it.rinfo();
-      rinfo->WipeOut();
+      rinfo->WipeOut(serializer_->isolate());
     }
     // We need to wipe out the header fields *after* wiping out the
     // relocations, because some of these fields are needed for the latter.