[ARM][Debug Info] Restore emitting of .cfi_def_cfa_offset for functions without stack frame

Summary: Looks like new code from [[ http://reviews.llvm.org/rL222057 | rL222057 ]] doesn't account for early `return` in `ARMFrameLowering::emitPrologue`, which leads to loosing `.cfi_def_cfa_offset` directive for functions without stack frame.

Reviewers: echristo, rengolin, asl, t.p.northover

Reviewed By: t.p.northover

Subscribers: llvm-commits, rengolin, aemerson

Differential Revision: http://reviews.llvm.org/D8606

llvm-svn: 234399

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/Target/ARM/ARMFrameLowering.cpp b/llvm/lib/Target/ARM/ARMFrameLowering.cpp
index 830953b2b0c..9d2b09b4067 100644
--- a/llvm/lib/Target/ARM/ARMFrameLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMFrameLowering.cpp
@@ -311,6 +311,7 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF) const {
     return;
 
   StackAdjustingInsts DefCFAOffsetCandidates;
+  bool HasFP = hasFP(MF);
 
   // Allocate the vararg register save area.
   if (ArgRegsSaveSize) {
@@ -327,6 +328,7 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF) const {
       DefCFAOffsetCandidates.addInst(std::prev(MBBI),
                                      NumBytes - ArgRegsSaveSize, true);
     }
+    DefCFAOffsetCandidates.emitDefCFAOffsets(MMI, MBB, dl, TII, HasFP);
     return;
   }
 
@@ -375,7 +377,6 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF) const {
   }
 
   // Determine starting offsets of spill areas.
-  bool HasFP = hasFP(MF);
   unsigned GPRCS1Offset = NumBytes - ArgRegsSaveSize - GPRCS1Size;
   unsigned GPRCS2Offset = GPRCS1Offset - GPRCS2Size;
   unsigned DPRAlign = DPRCSSize ? std::min(8U, Align) : 4U;