[clang] [llvm] [AArch64] Add support for C2 CPUs (PR #229055)

[David Green via cfe-commits]

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@@ -924,6 +924,12 @@ features cannot lower the translation-unit ABI level;
 
 #### Arm and AArch64 Support
 
+- Added support for the following Arm processors (command-line identifiers in
+  parentheses):
+
+  - C2-Pro (`c2-pro`), an alias for C1-Pro.
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davemgreen wrote:

Can remove the alias bit here, its more of an internal detail.

https://github.com/llvm/llvm-project/pull/229055