[ARM64][Windows] Add unwind support to llvm-readobj

This patch adds support for dumping the unwind info from ARM64 COFF object
files.

Differential Revision: https://reviews.llvm.org/D53264

llvm-svn: 345108
diff --git a/llvm/tools/llvm-readobj/COFFDumper.cpp b/llvm/tools/llvm-readobj/COFFDumper.cpp
index fe31c36..26fe1aa 100644
--- a/llvm/tools/llvm-readobj/COFFDumper.cpp
+++ b/llvm/tools/llvm-readobj/COFFDumper.cpp
@@ -1549,8 +1549,10 @@
     Dumper.printData(Ctx);
     break;
   }
+  case COFF::IMAGE_FILE_MACHINE_ARM64:
   case COFF::IMAGE_FILE_MACHINE_ARMNT: {
-    ARM::WinEH::Decoder Decoder(W);
+    ARM::WinEH::Decoder Decoder(W, Obj->getMachine() ==
+                                       COFF::IMAGE_FILE_MACHINE_ARM64);
     Decoder.dumpProcedureData(*Obj);
     break;
   }