[PATCH][PR target/97532] Fix invalid address for special memory constraint.

[Hongtao Liu]

Hi:
  Sorry for Incomplete test for my last patch at
https://gcc.gnu.org/pipermail/gcc-patches/2020-October/555948.html.
  This patch should fix invalid address introduced by special memory constraint.
  Bootstrap is ok, regression test is ok for make check
RUNTESTFLAGS="--target_board='unix{-m32,}'"

gcc/ChangeLog
        PR target/97532
        * gcc/lra-constraints.c (valid_address_p): Handle operand of
        special memory constraint.
        (process_address_1): Ditto.

--
BR,
Hongtao
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