[arm] Fix big-endian function argument.

[Paul Brook]

The attached patch fixes integer function arguments < 4 bytes passed in memory 
on big-endian arm targets. DEFAULT_FUNCTION_ARG_PADDING returns an enum, not 
true/false.

Tested with cross to arm-none-elf/-mbig-endian.
Applied to mainline and csl-arm-branch.
4.0 is not effected.

Paul

2005-07-07  Paul Brook  <paul@codesourcery.com>

	* config/arm/arm.c (arm_pad_arg_upward): Compare return value of
	DEFAULT_FUNCTION_ARG_PADDING to upward.
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