PR rtl-optimization/23478 * local-alloc.c (struct qty): Add n_throwing_calls_crossed field. (alloc_qty): Initialize it. (update_equiv_regs): Clear REG_N_THROWING_CALLS_CROSSED. (combine_regs): Combine also n_throwing_calls_crossed fields. (find_free_reg): Don't attempt to caller-save pseudos crossing calls that might throw. * global.c (struct allocno): Add throwing_calls_crossed field. (global_alloc): Revert 2005-08-22 change. Initialize throwing_calls_crossed. (find_reg): Don't attempt to caller-save pseudos crossing calls that might throw. From-SVN: r103718
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