[PATCH, ARM]: Clean up handling of structure returns

[Richard Earnshaw <Richard dot Earnshaw at buzzard dot freeserve dot co dot uk>]

This is a minor cleanup of the way we handle structure returns on ARM and 
ensures that we generate consistent code in all cases.  The compiler 
defaults to passing an invisible first parameter of where to return the 
result if 'return-in-memory' so there is no need for the ARM back-end to 
try and work this out itself.

Tested with an arm-eabi cross compiler and a native bootstrap on 
arm-netbsd (thus covering both old and new ABIs).

2006-05-10  Richard Earnshaw  <rearnsha@arm.com>

	* arm.c (arm_struct_value_rtx): Delete.
	(TARGET_STRUCT_VALUE_RTX): Use the default definition.
	(arm_init_cumulative_args): Always initialize nregs to zero.

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