[SystemZ] Fix caller-allocated save slot FIXME

Get rid of some old code (and associated FIXME) for handling the
caller-allocated register save area.  No behavioural change intended.

llvm-svn: 185525
diff --git a/llvm/lib/Target/SystemZ/SystemZMachineFunctionInfo.h b/llvm/lib/Target/SystemZ/SystemZMachineFunctionInfo.h
index 1dc05a7..69c2691 100644
--- a/llvm/lib/Target/SystemZ/SystemZMachineFunctionInfo.h
+++ b/llvm/lib/Target/SystemZ/SystemZMachineFunctionInfo.h
@@ -15,7 +15,6 @@
 namespace llvm {
 
 class SystemZMachineFunctionInfo : public MachineFunctionInfo {
-  unsigned SavedGPRFrameSize;
   unsigned LowSavedGPR;
   unsigned HighSavedGPR;
   unsigned VarArgsFirstGPR;
@@ -26,14 +25,8 @@
 
 public:
   explicit SystemZMachineFunctionInfo(MachineFunction &MF)
-    : SavedGPRFrameSize(0), LowSavedGPR(0), HighSavedGPR(0), VarArgsFirstGPR(0),
-      VarArgsFirstFPR(0), VarArgsFrameIndex(0), RegSaveFrameIndex(0),
-      ManipulatesSP(false) {}
-
-  // Get and set the number of bytes allocated by generic code to store
-  // call-saved GPRs.
-  unsigned getSavedGPRFrameSize() const { return SavedGPRFrameSize; }
-  void setSavedGPRFrameSize(unsigned bytes) { SavedGPRFrameSize = bytes; }
+    : LowSavedGPR(0), HighSavedGPR(0), VarArgsFirstGPR(0), VarArgsFirstFPR(0),
+      VarArgsFrameIndex(0), RegSaveFrameIndex(0), ManipulatesSP(false) {}
 
   // Get and set the first call-saved GPR that should be saved and restored
   // by this function.  This is 0 if no GPRs need to be saved or restored.