vendor/llvm/llvm-trunk-r238337

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/Target/SystemZ/SystemZFrameLowering.cpp b/lib/Target/SystemZ/SystemZFrameLowering.cpp
index eff4ae3baf3f5..a636b35635ce3 100644
--- a/lib/Target/SystemZ/SystemZFrameLowering.cpp
+++ b/lib/Target/SystemZ/SystemZFrameLowering.cpp
@@ -309,8 +309,9 @@ static void emitIncrement(MachineBasicBlock &MBB,
   }
 }
 
-void SystemZFrameLowering::emitPrologue(MachineFunction &MF) const {
-  MachineBasicBlock &MBB = MF.front();
+void SystemZFrameLowering::emitPrologue(MachineFunction &MF,
+                                        MachineBasicBlock &MBB) const {
+  assert(&MF.front() == &MBB && "Shrink-wrapping not yet supported");
   MachineFrameInfo *MFFrame = MF.getFrameInfo();
   auto *ZII =
       static_cast<const SystemZInstrInfo *>(MF.getSubtarget().getInstrInfo());