Removed IP_reg, SP_reg and FL_reg definitions to avoid potential
aliasing optimization problems.

diff --git a/debugger/stack.c b/debugger/stack.c
index dd64c5c..03924b0 100644
--- a/debugger/stack.c
+++ b/debugger/stack.c
@@ -211,7 +211,7 @@
         is16 = FALSE;
     } else {
         frames[0].cs = addr.seg = cs;
-        frames[0].eip = addr.off = IP_reg(&DEBUG_context);
+        frames[0].eip = addr.off = LOWORD(EIP_reg(&DEBUG_context));
         if (noisy)
           frames[0].frame = DEBUG_PrintAddress( &addr, 16, TRUE );
         else