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PR rtl-optimization/88390 * dwarf2cfi.c (struct dw_cfi_row): Add window_save field. (cfi_row_equal_p): Compare it. (dwarf2out_frame_debug_cfa_window_save): Add FAKE parameter. If FAKE is false, set window_save of the current row. (dwarf2out_frame_debug) <REG_CFA_TOGGLE_RA_MANGLE>: Call above function with FAKE parameter set to true. <REG_CFA_WINDOW_SAVE>: Likewise but with FAKE parameter set to false. (change_cfi_row): Emit a DW_CFA_GNU_window_save if necessary. From-SVN: r266906
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