win: Implement exception snapshot

util/win/process_structs.h

Index: util/win/process_structs.h
diff --git a/util/win/process_structs.h b/util/win/process_structs.h
index 65f0aac01109c38b4de2d302abcd007f745f8324..6055079d25947c49f218edadabd007095daf94a0 100644
--- a/util/win/process_structs.h
+++ b/util/win/process_structs.h
@@ -343,6 +343,20 @@ struct SYSTEM_EXTENDED_THREAD_INFORMATION {
   typename Traits::Pointer Reserved3;
 };
 
+// See http://undocumented.ntinternals.net/source/usermode/structures/thread_basic_information.html.
+template <class Traits>
+struct THREAD_BASIC_INFORMATION {
+  union {
+    DWORD ExitStatus;
+    typename Traits::Pad padding_for_x64;
+  };
+  typename Traits::Pointer TebBaseAddress;
+  CLIENT_ID<Traits> ClientId;
+  typename Traits::Pointer AffinityMask;
+  LONG Priority;
+  LONG BasePriority;
+};
+
 // See http://undocumented.ntinternals.net/source/usermode/undocumented%20functions/system%20information/structures/system_process_information.html
 template <class Traits>
 struct SYSTEM_PROCESS_INFORMATION {