internal: support const on UnsafeCell
#374
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I'll close this PR because I didn't realize it wasn't possible to const-ify some code here due to Loom's tracking code not being usable in const contexts. |
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This method was
constsince 1.32 (https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.new) and some code in Salsa makes use of creatingUnsafeCells in const contexts.(Salsa is heavily used used by rust-analyzer and I'm spending a bit of time to make sure rust-analyzer's dependencies are reliable.)