Add flag to enable Dwarf exception handling on ARM

lib/Target/ARM/MCTargetDesc/ARMMCAsmInfo.h

 //===-- ARMMCAsmInfo.h - ARM asm properties --------------------*- C++ -*--===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file contains the declaration of the ARMMCAsmInfo class.
@@ skipping 14 matching lines @@
   public:
     explicit ARMMCAsmInfoDarwin(StringRef TT);
   };
 
   class ARMELFMCAsmInfo : public MCAsmInfoELF {
     void anchor() override;
   public:
     explicit ARMELFMCAsmInfo(StringRef TT);
 
     void setUseIntegratedAssembler(bool Value) override;
-
-    // @LOCALMOD-BEGIN
-    // Exceptions handling
-    void setExceptionsType(ExceptionHandling ExType) {
-       ExceptionsType = ExType;
-    }
-    // @LOCALMOD-END
   };
 
   class ARMCOFFMCAsmInfoMicrosoft : public MCAsmInfoMicrosoft {
     void anchor() override;
   public:
     explicit ARMCOFFMCAsmInfoMicrosoft();
   };
 
   class ARMCOFFMCAsmInfoGNU : public MCAsmInfoGNUCOFF {
     void anchor() override;
   public:
     explicit ARMCOFFMCAsmInfoGNU();
   };
 
 } // namespace llvm
 
 #endif