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        * recog.c (validate_replace_rtx_group): New function.
        * recog.h (validate_replace_rtx_group): Declare it.
        * regmove.c (optimize_reg_copy_3): If any substitution fails, then undo
        the entire group of substitutions.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@21909 138bc75d-0d04-0410-961f-82ee72b054a4