cppbuiltin.c (define_builtin_macros_for_type_sizes): Define __FLOAT_WORD_ORDER__ according to FLOAT_WORDS_BIG_ENDIAN.

gcc/
	* cppbuiltin.c (define_builtin_macros_for_type_sizes): Define
	__FLOAT_WORD_ORDER__ according to FLOAT_WORDS_BIG_ENDIAN.
	* config/dfp-bit.h (LIBGCC2_FLOAT_WORDS_BIG_ENDIAN): Delete.
	* doc/cpp.texi (__FLOAT_WORD_ORDER__): Document.
	* system.h (LIBGCC2_FLOAT_WORDS_BIG_ENDIAN): Poison.

libgcc/
	* config/libbid/bid_conf.h (BID_BIG_ENDIAN): Define in terms of
	__FLOAT_WORD_ORDER__.
	* config/libbid/bid_gcc_intrinsics.h (LIBGCC2_FLOAT_WORDS_BIG_ENDIAN):
	Delete.

libdecnumber/
	* dconfig.h (LIBGCC2_FLOAT_WORDS_BIG_ENDIAN): Delete.
	(WORDS_BIG_ENDIAN): Define based on value of __FLOAT_WORD_ORDER__.

From-SVN: r167129