* rtl.h (LCT_RETURNS_TWICE): New.
        * calls.c (emit_call_1): Set current_function_calls_setjmp for
        ECF_RETURNS_TWICE.
        (emit_library_call_value_1): Map LCT_RETURNS_TWICE
        to ECF_RETURNS_TWICE.
        * except.c (sjlj_emit_function_enter): Use LCT_RETURNS_TWICE for
        call to setjmp.

        * unwind-sjlj.c: Invent the setjmp.h declarations if inhibit_libc.

        * config/stormy16/stormy16.h (DONT_USE_BUILTIN_SETJMP): New.
        (JMP_BUF_SIZE): New.

From-SVN: r45736