[llvm] [BOLT][AArch64] Handle OpNegateRAState to enable optimizing binaries with pac-ret hardening (PR #120064)

[Maksim Panchenko via llvm-commits]

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@@ -72,7 +72,12 @@ class MCAnnotation {
     kLabel,               /// MCSymbol pointing to this instruction.
     kSize,                /// Size of the instruction.
     kDynamicBranch,       /// Jit instruction patched at runtime.
-    kGeneric              /// First generic annotation.
+    kSigned,              /// Inst is in a range where RA is signed.
+    kUnsigned,            /// Inst is in a range where RA is unsigned.
+    kRememberState,       /// Inst has rememberState CFI.
+    kRestoreState,        /// Inst has restoreState CFI.
+    kNegateState,         /// Inst has OpNegateRAState CFI.
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maksfb wrote:

nit: for clarity, let's add `RA`. E.g., `kSigned` -> `kRASigned`, etc.

https://github.com/llvm/llvm-project/pull/120064