Add a new subtarget hook for whether or not we'd like to enable

the atomic load linked expander pass to run for a particular
subtarget. This requires a check of the subtarget and so save
the TargetMachine rather than only TargetLoweringInfo and update
all callers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211314 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMSubtarget.cpp

@@ -417,6 +417,10 @@ bool ARMSubtarget::enablePostMachineScheduler() const {
   return PostRAScheduler;
 }
 
+bool ARMSubtarget::enableAtomicExpandLoadLinked() const {
+  return hasAnyDataBarrier() && !isThumb1Only();
+}
+
 bool ARMSubtarget::enablePostRAScheduler(
            CodeGenOpt::Level OptLevel,
            TargetSubtargetInfo::AntiDepBreakMode& Mode,