Add unstable book page for the no-jump-tables codegen option

src/doc/unstable-book/src/compiler-flags/no-jump-tables.md

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+# `no-jump-tables`
+
+The tracking issue for this feature is [#116592](https://github.com/rust-lang/rust/issues/116592)
+
+---
+
+This option enables the `-fno-jump-tables` flag for LLVM, which makes the
+codegen backend avoid generating jump tables when lowering switches.
+
+This option adds the LLVM `no-jump-tables=true` attribute to every function.
+
+The option can be used to help provide protection against
+jump-oriented-programming (JOP) attacks, such as with the linux kernel's [IBT].
+
+```sh
+RUSTFLAGS="-Zno-jump-tables" cargo +nightly build -Z build-std
+```
+
+[IBT]: https://www.phoronix.com/news/Linux-IBT-By-Default-Tip