[ARM][AArch64] Split out processor and feature tablegen defs [NFC] (#88282)

Author: tmatheson-arm

llvm/lib/Target/AArch64/AArch64.td

@@ -10,9 +10,14 @@
 //
 //===----------------------------------------------------------------------===//
 
+
 //===----------------------------------------------------------------------===//
 // ARM Instruction Predicate Definitions.
 //
+
+class AssemblerPredicateWithAll<dag cond, string name="">
+    : AssemblerPredicate<(any_of FeatureAll, cond), name>;
+
 def HasV8_0a         : Predicate<"Subtarget->hasV8_0aOps()">,
                                  AssemblerPredicate<(all_of HasV8_0aOps), "armv8.0a">;
 def HasV8_1a         : Predicate<"Subtarget->hasV8_1aOps()">,