Add support for .ARM.exidx unwind information

.ARM.exidx/.ARM.extab sections contain unwind information used on ARM
architecture from unwinding from an exception.

Differential revision: http://reviews.llvm.org/D13245

llvm-svn: 248903

lldb/source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp

@@ -1342,6 +1342,8 @@ ObjectFileMachO::GetAddressClass (lldb::addr_t file_addr)
                         return eAddressClassDebug;
 
                     case eSectionTypeEHFrame:
+                    case eSectionTypeARMexidx:
+                    case eSectionTypeARMextab:
                     case eSectionTypeCompactUnwind:
                         return eAddressClassRuntime;