* config/avr/avr.c (out_adj_frame_ptr): Make "frame pointer

	change too big for -mtiny-stack" a warning, if larger than 63.
	(out_set_stack_ptr): Change the logic so -mno-interrupts is
	always safe to use on possible future devices.
	(function_prologue): Write SPH before SPL, for consistency.
	If interrupt_func_p true, we know we have enabled interrupts.
	(avr_num_arg_regs): New function.  Round up to even number of
	bytes if no -mpack-args or if calling a libgcc function.
	(function_arg, function_arg_advance): Use it.
	(output_movsisf, ashlsi3_out, ashrsi3_out, lshrsi3_out):
	Output "movw" if available.
	(out_tsthi, out_tstsi, ashlqi3_out, lshrqi3_out): Change uses
	of TEST_HARD_REG_CLASS macro to test_hard_reg_class function.
	(asm_output_section_name): Add blanks for consistent output.
	(encode_section_info): Set TREE_READONLY for progmem data to
	avoid gas warnings about changed section attributes.
	(avr_hard_regno_mode_ok): Force non-QImode data to start in
	even numbered registers on devices with "movw".
	* config/avr/avr.h (MASK_*): Define bits for target_flags.
	(TARGET_SWITCHES): Mark help strings for translation.
	Add new -mpack-args and -menhanced switches.
	(TARGET_OPTIONS): Mark help strings for translation.
	(progmem_section): Add section attributes.
	* config/avr/avr.md (*movhi, call_insn, call_value_insn):
	Output "movw" if available.
	(mulqi3, mulqihi3, umulqihi3, mulhi3, *tablejump_enh):
	New patterns.
	* config/avr/libgcc.S (_mulqi3, _divqi3): Update to the new
	call convention (arguments aligned on even registers).
	(_cleanup, _exit): Make weak symbols libc can override.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@34847 138bc75d-0d04-0410-961f-82ee72b054a4

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