msvcrt: Improve x86_64 nested exceptions handling

[Piotr Caban]

Signed-off-by: Piotr Caban <piotr at codeweavers.com>
---
  dlls/msvcrt/except_x86_64.c | 48 
++++++++++++++++++++++++++++++++-------------
  1 file changed, 34 insertions(+), 14 deletions(-)


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