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* config/xtensa/xtensa.c (xtensa_expand_prologue): Put a REG_FRAME_RELATED_EXPR note on the last insn that sets up the stack pointer or frame pointer. * config/xtensa/xtensa.h (DWARF_UNWIND_INFO): Delete. (MUST_USE_SJLJ_EXCEPTIONS): Define. (DWARF2_UNWIND_INFO): Define. (INCOMING_RETURN_ADDR_RTX): Define. (DWARF_FRAME_RETURN_COLUMN): Define. From-SVN: r129854
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