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Patch ping


Hi!

- PR54921 invalidate sp in cselib on fp setter insn
  http://gcc.gnu.org/ml/gcc-patches/2012-10/msg02035.html
  (perhaps in light of PR54402 the single_succ (ENTRY_BLOCK_PTR)
  from the patch should be nuked)

- PR55188 testcase fix for targets with different branch cost
  http://gcc.gnu.org/ml/gcc-patches/2012-11/msg00361.html

- PR55137 fold reassociation fix
  http://gcc.gnu.org/ml/gcc-patches/2012-11/msg00636.html
  (alternatively also retry with unsigned atype if the reassociation
  would fail otherwise)

- PR55236 range test optimization fix with -fwrapv
  http://gcc.gnu.org/ml/gcc-patches/2012-11/msg00707.html
  (perhaps PLUS_EXPR can be handled similarly instead of bailing out)

	Jakub


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