[llvm] [AArch64] Restore Z-registers before P-registers (PR #79623)

[Sander de Smalen via llvm-commits]

================
@@ -3201,11 +3196,27 @@ bool AArch64FrameLowering::restoreCalleeSavedRegisters(
     return true;
   }
 
+  // For performance reasons restore SVE register in increasing order
+  auto PPRBegin =
+      std::find_if(RegPairs.begin(), RegPairs.end(), [](const RegPairInfo &c) {
+        return c.Type == RegPairInfo::PPR;
+      });
----------------
sdesmalen-arm wrote:

nit:
```suggestion
  auto IsPPR = [](const RegPairInfo &c) { return c.Type == RegPairInfo::PPR; };
  auto PPRBegin = std::find_if(RegPairs.begin(), RegPairs.end(), IsPPR);
  auto PPREnd = std::find_if(RegPairs.rbegin(), RegPairs.rend(), IsPPR);
```

(same suggestion for ZPR)

https://github.com/llvm/llvm-project/pull/79623