[Aarch64] Turn on the LoopDataPrefetch pass for Cyclone

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264811 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit f6d6e72)

Author: anemet

lib/Target/AArch64/AArch64TargetMachine.cpp

@@ -95,7 +95,7 @@ EnableGlobalMerge("aarch64-global-merge", cl::Hidden,
 static cl::opt<bool>
     EnableLoopDataPrefetch("aarch64-loop-data-prefetch", cl::Hidden,
                            cl::desc("Enable the loop data prefetch pass"),
-                           cl::init(false));
+                           cl::init(true));
 
 extern "C" void LLVMInitializeAArch64Target() {
   // Register the target.