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gcc/ * df.h (df_mw_hardreg): Remove "loc" field. * df-scan.c (df_ref_record): Don't set it. Remove redundant local variable. * df-problems.c (df_whole_mw_reg_unused_p): New function, split out from df_set_unused_notes_for_mw. Return false for partial references. Assert that mw_reg is a REG when returning true. (df_set_unused_notes_for_mw): Use it. Use mw_reg instead of *loc. (df_whole_mw_reg_dead_p): New function, split out from df_set_dead_notes_for_mw. Return false for partial references. Assert that mw_reg is a REG when returning true. (df_set_dead_notes_for_mw): Use it. Use mw_reg instead of *loc. Remove redundant bitmap check. From-SVN: r126970
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