[builtins] Remove indirection for pointers to code and data blobs
Mark the labels to the code and data global, which removes the need for having separate pointers to these labels in the .data section. This means that `v8_Default_embedded_blob_code_` and `v8_Default_embedded_blob_data_` can now actually be read-only when RELRO is enabled. The actual contents of `v8_Default_embedded_blob_code_` remain potentially non-readable for platforms where code is marked as execute-only, but these changes do not attempt to read them. Bug: v8:12850 Change-Id: Ic1bc8e68fe44a9ce45380c83b0be5fa94e7da267 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3616510 Commit-Queue: Georgia Kouveli <georgia.kouveli@arm.com> Reviewed-by:Jakob Linke <jgruber@chromium.org> Cr-Commit-Position: refs/heads/main@{#80331}
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