[PATCH] Fix redundant load missed by fre [tree-optimization 92980]

[Hongtao Liu]

Hi:
  This patch is to simplify A * C + (-D) -> (A - D/C) * C when C is a
power of 2 and D mod C == 0.
  bootstrap and make check is ok.

changelog
gcc/
        * gcc/match.pd (A * C + (-D) = (A - D/C) * C. when C is a
        power of 2 and D mod C == 0): Add new simplification.

gcc/testsuite
        * gcc.dg/pr92980.c: New test.

-- 
BR,
Hongtao
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