Hi,

this patch removes BITS_BIG_ENDIAN from defs.h by replacing it with its expression. The way to recognize
endianess of a target is gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG which is widely used by most files.
So this macro is unnecessary. The other patch removes BITS_BIG_ENDIAN from the documentation.
This patch introduces some new current_gdbarch's which will be replaced by a later patch. 

Tested on x86 without regressions. Is this ok ?

ChangeLog:

	* value.h: Correct comment.
	* value.c (struct value): Likewise.
	* gdbtypes.h (struct field): Likewise.

	(unpack_field_as_long, modify_field): Replace BITS_BIG_ENDIAN by its
	expression.
	* valops.c (value_slice): Likewise.
	* valarith.c (value_subscript, value_bit_index): Likewise.
	* eval.c (evaluate_subexp_standard): Likewise.
	* dwarf2read.c (dwarf2_add_field): Likewise.
	* ada-lang.c (decode_packed_array, ada_value_primitive_packed_val)
	(move_bits, ada_value_assign, value_assign_to_component): Likewise.

	* defs.h (BITS_BIG_ENDIAN): Remove.


ChangeLog doc:

	* gdbint.texinfo (BITS_BIG_ENDIAN): Remove.


-- 
  Markus Deuling
  GNU Toolchain for Linux on Cell BE
  deuling@de.ibm.com