libunwind: limit stack usage in unwind cursor

Obtained from FreeBSD SVN r302475

Differential Revision:	https://reviews.llvm.org/D22570


git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@276128 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/DwarfParser.hpp b/src/DwarfParser.hpp
index cff0e82..62c047b 100644
--- a/src/DwarfParser.hpp
+++ b/src/DwarfParser.hpp
@@ -62,7 +62,7 @@
   };
 
   enum {
-    kMaxRegisterNumber = 120
+    kMaxRegisterNumber = _LIBUNWIND_HIGHEST_DWARF_REGISTER
   };
   enum RegisterSavedWhere {
     kRegisterUnused,