SourcePath only manipulates path names now. all accesses must go through
a checked path going forward to ensure we don't escape restriction lists
of pure and restricted evaluation. if a directory path is checked it can
safely be assumed that the directory itself is allowed, and its contents
will likewise be safe to access. it is tempting to assumed that contents
will also be fine, but that's only true if the content is not a symlink.
Change-Id: Icec3098d53fe9dce50997954ba958fe4f304d59b
not all of these are even used by eval itself. notably sWith wasn't used
at all, sEpsilon was only used by the eval cache one layer up, and other
attributes are used in places even further away from eval itself. we can
keep this commingling for now, but eventually we should clean it up too.
Change-Id: I5684ac614361bf008e04472130c6c02082b4c2d7
clangd broke because it can't look through symlinks. compile_commands
manipulation does not fix it, clangd configuration does not fix it, a
vfs overlay does not fix it, and while a combination of those can fix
it with a bind mount in place that's just too cursed to even consider
clangd bug: https://github.com/llvm/llvm-project/issues/116877
Change-Id: I8e3e8489548eb3a7aa65ac9d12a5ec8abf814aec
