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RISCV target developers need a flag to prevent creating insns in IRA which can not be split after RA as they will need a temporary reg. The patch introduces such flag. gcc/ChangeLog: * rtl.h (lra_in_progress): Change type to bool. (ira_in_progress): Add new extern. * ira.cc (ira_in_progress): New global. (pass_ira::execute): Set up ira_in_progress. * lra.cc: (lra_in_progress): Change type to bool and initialize. (lra): Use bool values for lra_in_progress. * lra-eliminations.cc (init_elim_table): Ditto.
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