[RISCV][NFC] Add CFI-related tests

Summary: Adds tests necessary to properly show the impact of other
patches that affect the emission of CFI directives.

Reviewers: asb, lenary
Reviewed By: lenary
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D69721

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Target/RISCV/RISCVFrameLowering.cpp b/llvm/lib/Target/RISCV/RISCVFrameLowering.cpp
index daa7b7a7ea9..6344ed448ad 100644
--- a/llvm/lib/Target/RISCV/RISCVFrameLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVFrameLowering.cpp
@@ -228,6 +228,8 @@ void RISCVFrameLowering::emitPrologue(MachineFunction &MF,
   }
 }
 
+// FIXME Fix emission of .cfi_restore and .cfi_def_cfa CFI directives that can
+// incorrectly affect subsequent basic blocks.
 void RISCVFrameLowering::emitEpilogue(MachineFunction &MF,
                                       MachineBasicBlock &MBB) const {
   MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();