[serialize] explicitly serialize code content upfront.
The serializer performs two passes over the code. The first pass copies out the code content verbatim, the second pass visits references recorded in the reloc info. So far the first pass is implicit and happens as part of the second pass, when we encounter a non-HeapObject reference when iterating the code object. That however does not work for internal references. So we hit an assertion if the first non-HeapObject reference we see is an internal reference. This change explicitly triggers the first pass. R=petermarshall@chromium.org Bug: v8:6817 Change-Id: I1ee9949e10b7d9409986da83be22ac6287785f9f Reviewed-on: https://chromium-review.googlesource.com/663867Reviewed-by: Peter Marshall <petermarshall@chromium.org> Reviewed-by: Yang Guo <yangguo@chromium.org> Commit-Queue: Yang Guo <yangguo@chromium.org> Cr-Commit-Position: refs/heads/master@{#48010}
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