Some platforms disable reading of bytes in the .text section,
so move the metadata into a separate .rodata section.

Bug: v8:10707
Change-Id: I30ef7a180f489f175c31f9d4dcd02115c9f516c2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2301113
Commit-Queue: Toan Pham <toanpham@google.com>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68984}