Add flag to enable Dwarf exception handling on ARM

lib/Target/ARM/ARMSubtarget.h

Index: lib/Target/ARM/ARMSubtarget.h
diff --git a/lib/Target/ARM/ARMSubtarget.h b/lib/Target/ARM/ARMSubtarget.h
index f646f1537b7cebc37f8f94438085720be53650e1..a65a939fb4e63096021a72c4a64c61d14522af2d 100644
--- a/lib/Target/ARM/ARMSubtarget.h
+++ b/lib/Target/ARM/ARMSubtarget.h
@@ -40,6 +40,8 @@ class GlobalValue;
 class StringRef;
 class TargetOptions;
 
+extern cl::opt<bool>  EnableARMDwarfEH; // @LOCALMOD
+
 class ARMSubtarget : public ARMGenSubtargetInfo {
 protected:
   enum ARMProcFamilyEnum {
@@ -383,7 +385,7 @@ public:
             TargetTriple.getEnvironment() == Triple::EABIHF ||
             TargetTriple.getEnvironment() == Triple::GNUEABIHF ||
             TargetTriple.getEnvironment() == Triple::Android) &&
-           !isTargetDarwin() && !isTargetWindows();
+        !isTargetDarwin() && !isTargetWindows() && !EnableARMDwarfEH;//@LOCALMOD

[JF, 2014/11/19 19:32:05]

!isTargetNaCl() ?

[Derek Schuff, 2014/11/19 19:56:48]

isTargetNaCl doesn't work for Non-SFI mode, which uses the Linux OS.

but !isTargetNaCl shoud probably be included for SFI NaCl though.

   }
 
   bool isTargetHardFloat() const {