* README: Add section discussing status of ELF ABI.
* i370.c: Fix misc spelling mistakes.
(i370_label_scan): Updated notes, exception handling.
(i370_function_prolog): Simplify ELF stack handling.
* i370.h: (FIXED_REGISTERS): Free up r12 for ELF.
(STACK_GROWS_DOWNWARD): ELF stack grows down.
(ASM_DECLARE_FUNCTION_NAME): Fix crazy malloc size.
* i370.md: (movdi): Add notes.
(floatsidf2): Use stack not rtca for scratch float area.
(iorsi3): Correct operand constraints.
* x-oe: Restore TAROUTOPTS which are used by pax.