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xtensa: rearrange unaligned exception handler
Max Filippov authored

- extract initialization part of the exception handler into a separate
  function.
- use single label for invalid instruction instead of two labels, one
  for load and one for store, at one place.
- use sext instruction for sign extension when available.
- store SAR on the stack instead of in a0.
- replace numeric labels for load and store writeback with .Lload_w and
  .Lstore_w respectively.
Signed-off-by: default avatarMax Filippov <jcmvbkbc@gmail.com>
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