Revert accidental commit.

llvm-svn: 131739

lib/Target/ARM/ARMISelLowering.cpp

@@ -1182,7 +1182,7 @@ ARMTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
   bool IsStructRet    = (Outs.empty()) ? false : Outs[0].Flags.isSRet();
   bool IsSibCall = false;
   // Temporarily disable tail calls so things don't break.
-  if (!EnableARMTailCalls && !Subtarget->supportsTailCall())
+  if (!EnableARMTailCalls)
     isTailCall = false;
   if (isTailCall) {
     // Check if it's really possible to do a tail call.

lib/Target/ARM/ARMSubtarget.cpp

@@ -46,7 +46,6 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS,
   , PostRAScheduler(false)
   , IsR9Reserved(ReserveR9)
   , UseMovt(false)
-  , SupportsTailCall(false)
   , HasFP16(false)
   , HasD16(false)
   , HasHardwareDivide(false)
@@ -154,8 +153,6 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS,
   else {
     IsR9Reserved = ReserveR9 | (ARMArchVersion < V6);
     UseMovt = DarwinUseMOVT && hasV6T2Ops();
-    const Triple &T = getTargetTriple();
-    SupportsTailCall = T.getOS() == Triple::IOS && !T.isOSVersionLT(5, 0);
   }
 
   if (!isThumb() || hasThumb2())

lib/Target/ARM/ARMSubtarget.h

@@ -87,11 +87,6 @@ protected:
   /// imms (including global addresses).
   bool UseMovt;
 
-  /// SupportsTailCall - True if the OS supports tail call. The dynamic linker
-  /// must be able to synthesize call stubs for interworking between ARM and
-  /// Thumb.
-  bool SupportsTailCall;
-
   /// HasFP16 - True if subtarget supports half-precision FP (We support VFP+HF
   /// only so far)
   bool HasFP16;
@@ -222,7 +217,6 @@ protected:
   bool isR9Reserved() const { return IsR9Reserved; }
 
   bool useMovt() const { return UseMovt && hasV6T2Ops(); }
-  bool supportsTailCall() const { return SupportsTailCall; }
 
   bool allowsUnalignedMem() const { return AllowsUnalignedMem; }