Outliner: add "target-cpu" feature from source function to outlined

The CPU is used to determine which inline asm instructions are allowed, so
needs to be copied across in case the outlined function contains any.

llvm/lib/CodeGen/TargetInstrInfo.cpp

@@ -1411,6 +1411,8 @@ void TargetInstrInfo::mergeOutliningCandidateAttributes(
   const Function &ParentFn = FirstCand.getMF()->getFunction();
   if (ParentFn.hasFnAttribute("target-features"))
     F.addFnAttr(ParentFn.getFnAttribute("target-features"));
+  if (ParentFn.hasFnAttribute("target-cpu"))
+    F.addFnAttr(ParentFn.getFnAttribute("target-cpu"));
 
   // Set nounwind, so we don't generate eh_frame.
   if (llvm::all_of(Candidates, [](const outliner::Candidate &C) {

llvm/test/CodeGen/AArch64/machine-outliner.ll

@@ -11,6 +11,7 @@
 ; TARGET_FEATURES-SAME: minsize
 ; TARGET_FEATURES-SAME: nounwind
 ; TARGET_FEATURES-SAME: optsize
+; TARGET_FEATURES-SAME: "target-cpu"="cyclone"
 ; TARGET_FEATURES-SAME: "target-features"="+sse"
 
 define linkonce_odr void @fish() #0 {