[AArch64] Set MaxInterleaving to 4 for Neoverse V2

This helps loop based benchmarks quite a lot, SPEC INT is unaffected.

Author: sjoerdmeijer

llvm/lib/Target/AArch64/AArch64Subtarget.cpp

@@ -233,9 +233,11 @@ void AArch64Subtarget::initializeProperties(bool HasMinSize) {
     PrefLoopAlignment = Align(32);
     MaxBytesForLoopAlignment = 16;
     break;
+  case NeoverseV2:
+    MaxInterleaveFactor = 4;
+    LLVM_FALLTHROUGH;
   case NeoverseN2:
   case NeoverseN3:
-  case NeoverseV2:
   case NeoverseV3:
     PrefFunctionAlignment = Align(16);
     PrefLoopAlignment = Align(32);

llvm/test/Transforms/LoopVectorize/AArch64/interleaving-load-store.ll

@@ -5,6 +5,7 @@
 ; RUN: opt -passes=loop-vectorize -mtriple=arm64-apple-macos -mcpu=apple-a14 -S %s | FileCheck --check-prefix=INTERLEAVE-4 %s
 ; RUN: opt -passes=loop-vectorize -mtriple=arm64-apple-macos -mcpu=apple-a15 -S %s | FileCheck --check-prefix=INTERLEAVE-4 %s
 ; RUN: opt -passes=loop-vectorize -mtriple=arm64-apple-macos -mcpu=apple-a16 -S %s | FileCheck --check-prefix=INTERLEAVE-4 %s
+; RUN: opt -passes=loop-vectorize -mtriple=arm64 -mcpu=neoverse-v2 -S %s | FileCheck --check-prefix=INTERLEAVE-4 %s
 
 ; Tests for selecting interleave counts for loops with loads and stores.
 

llvm/test/Transforms/LoopVectorize/AArch64/interleaving-reduction.ll

@@ -5,6 +5,7 @@
 ; RUN: opt -passes=loop-vectorize -mtriple=arm64-apple-macos -mcpu=apple-a14 -S %s | FileCheck --check-prefix=INTERLEAVE-4 %s
 ; RUN: opt -passes=loop-vectorize -mtriple=arm64-apple-macos -mcpu=apple-a15 -S %s | FileCheck --check-prefix=INTERLEAVE-4 %s
 ; RUN: opt -passes=loop-vectorize -mtriple=arm64-apple-macos -mcpu=apple-a16 -S %s | FileCheck --check-prefix=INTERLEAVE-4 %s
+; RUN: opt -passes=loop-vectorize -mtriple=arm64 -mcpu=neoverse-v2 -S %s | FileCheck --check-prefix=INTERLEAVE-4 %s
 
 ; Tests for selecting the interleave count for loops with reductions.