AArch64: Restrict macroop fusion heuristics to cyclone.

Even though this is just some hinting for the scheduler it doesn't make
sense to do that unless you know the target can perform the fusion.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242732 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/AArch64/AArch64InstrInfo.cpp

@@ -1445,6 +1445,7 @@ bool AArch64InstrInfo::shouldClusterLoads(MachineInstr *FirstLdSt,
 
 bool AArch64InstrInfo::shouldScheduleAdjacent(MachineInstr *First,
                                               MachineInstr *Second) const {
+  if (Subtarget.isCyclone()) {
     // Cyclone can fuse CMN, CMP, TST followed by Bcc.
     unsigned SecondOpcode = Second->getOpcode();
     if (SecondOpcode == AArch64::Bcc) {
@@ -1479,6 +1480,7 @@ bool AArch64InstrInfo::shouldScheduleAdjacent(MachineInstr *First,
         return true;
       }
     }
+  }
   return false;
 }