diff --git a/lib/Target/ARM/ARMAsmPrinter.cpp b/lib/Target/ARM/ARMAsmPrinter.cpp
index 9a1ce06f3a3..f93a45d3ada 100644
--- a/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -1136,8 +1136,14 @@ void ARMAsmPrinter::EmitUnwindingInstruction(const MachineInstr *MI) {
       assert(SrcReg == ARM::SP &&
              "Only stack pointer as a source reg is supported");
       for (unsigned i = StartOp, NumOps = MI->getNumOperands() - NumOffset;
-           i != NumOps; ++i)
-        RegList.push_back(MI->getOperand(i).getReg());
+           i != NumOps; ++i) {
+        const MachineOperand &MO = MI->getOperand(i);
+        // Actually, there should never be any impdef stuff here. Skip it
+        // temporary to workaround PR11902.
+        if (MO.isImplicit())
+          continue;
+        RegList.push_back(MO.getReg());
+      }
       break;
     case ARM::STR_PRE_IMM:
     case ARM::STR_PRE_REG: