[clang] [llvm] [AArch64] Correctly mark Neoverse N2 as an Armv9.0a core (PR #75055)

[David Spickett via llvm-commits]

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@@ -94,6 +94,11 @@ Changes to the AArch64 Backend
 
 * Added support for Cortex-A520, Cortex-A720 and Cortex-X4 CPUs.
 
+* Neoverse-N2 was incorrectly marked as an Armv8.5a core. This has been
+  changed to an Armv9.0a core. However, crypto options are not enabled
+  by default for Armv9 cores, so `-mcpu=neoverse-n2+crypto` is required
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DavidSpickett wrote:

Also clang would let you add sve2 to almost anything, but that's because it doesn't model the rules at all :)

https://github.com/llvm/llvm-project/pull/75055