Reland "[builtins] Remap builtins on Linux"
Reason for reland: Fixed Fuchsia build. Original change's description: > [builtins] Remap builtins on Linux > > This is a CL similar to > https://chromium-review.googlesource.com/c/v8/v8/+/3553006, but on Linux > rather than macOS. The goal is to allow builtins to use short builtin > calls without paying a memory cost, by remapping rather than copying > them. > > However, while macOS has a system call making this easier, on Linux we > don't have one on most kernels. There is the recently-introduced > mremap(MREMAP_DONTUNMMAP), which is available in 5.7, but only works on > anonymous mappings until 5.13, which is too recent for most Android > devices. > > Instead, we open() the file containing the builtins, and mmap() it at > the desired location. > > Change-Id: I4524f349948b8f48c4536cf392a1cd179662a6cc > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3570426 > Reviewed-by: Igor Sheludko <ishell@chromium.org> > Reviewed-by: Jakob Linke <jgruber@chromium.org> > Commit-Queue: Benoit Lize <lizeb@chromium.org> > Cr-Commit-Position: refs/heads/main@{#80022} Change-Id: I0cc8cf510bd2cb8621130bea8406d79aa209948c Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3596164Reviewed-by:Jakob Linke <jgruber@chromium.org> Reviewed-by:
Igor Sheludko <ishell@chromium.org> Commit-Queue: Benoit Lize <lizeb@chromium.org> Cr-Commit-Position: refs/heads/main@{#80049}
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