ntdll: Add debug registers to the context of all exceptions.
Maintain a local cache of the debug registers to avoid server calls
where possible.
diff --git a/include/winternl.h b/include/winternl.h
index 67403bb..a5a2e83 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -282,7 +282,7 @@
     PVOID           SystemReserved1[54];        /* 0cc used for kernel32 private data in Wine */
     PVOID           Spare1;                     /* 1a4 */
     LONG            ExceptionCode;              /* 1a8 */
-    BYTE            SpareBytes1[40];            /* 1ac */
+    BYTE            SpareBytes1[40];            /* 1ac used for ntdll private data in Wine */
     PVOID           SystemReserved2[10];        /* 1d4 used for ntdll private data in Wine */
     GDI_TEB_BATCH   GdiTebBatch;                /* 1fc */
     ULONG           gdiRgn;                     /* 6dc */