[PATCH/RFA] Generic big/little-endian handling for SH

[Jason R Thorpe <thorpej at wasabisystems dot com>]

This comes out of a discussion Joern and I had about the NetBSD SH
configuration.  What is does is allow the default byte order of the
target to be selected by including sh/little.h before the other tm
files (not unlike how the MIPS target works).  It also provides generic
big/little-endian tmake files that set the other byte order for multilib.

OK to commit?

	* config/sh/little.h: New file.
	* config/sh/sh.h (TARGET_ENDIAN_DEFAULT): If not already
	defined, define to 0 to select big-endian.
	(target_flags): Move the extern and the bit definitions
	further up the file so that they're available for testing
	by the preprocessor.
	(SUBTARGET_CPP_ENDIAN_SPEC): Provide defaults for big-
	and little-endian.
	(SUBTARGET_ASM_ENDIAN_SPEC): Likewise.
	(TARGET_DEFAULT): Include TARGET_ENDIAN_DEFAULT.
	* config/sh/sh64.h (TARGET_DEFAULT): Include TARGET_ENDIAN_DEFAULT.
	* config/sh/t-be: New file.
	* config/sh/t-le: New file.

-- 
        -- Jason R. Thorpe <thorpej@wasabisystems.com>

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