Re-apply 56683 with fixes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56748 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/MachineFrameInfo.h

@@ -118,6 +118,10 @@ class MachineFrameInfo {
   ///
   bool HasVarSizedObjects;
 
+  /// FrameAddressTaken - This boolean keeps track of whether there is a call
+  /// to builtin @llvm.frameaddress.
+  bool FrameAddressTaken;
+
   /// StackSize - The prolog/epilog code inserter calculates the final stack
   /// offsets for all of the fixed size objects, updating the Objects list
   /// above.  It then updates StackSize to contain the number of bytes that need
@@ -174,6 +178,7 @@ public:
   MachineFrameInfo(const TargetFrameInfo &tfi) : TFI(tfi) {
     StackSize = NumFixedObjects = OffsetAdjustment = MaxAlignment = 0;
     HasVarSizedObjects = false;
+    FrameAddressTaken = false;
     HasCalls = false;
     MaxCallFrameSize = 0;
     MMI = 0;
@@ -190,6 +195,12 @@ public:
   ///
   bool hasVarSizedObjects() const { return HasVarSizedObjects; }
 
+  /// isFrameAddressTaken - This method may be called any time after instruction
+  /// selection is complete to determine if there is a call to
+  /// @llvm.frameaddress in this function.
+  bool isFrameAddressTaken() const { return FrameAddressTaken; }
+  void setFrameAddressIsTaken(bool T) { FrameAddressTaken = T; }
+
   /// getObjectIndexBegin - Return the minimum frame object index...
   ///
   int getObjectIndexBegin() const { return -NumFixedObjects; }