PATCH: First part of 64-bit Darwin support, revised

[David Edelsohn]

Stan,

	I have reverted the MD portion of the patch and the rs6000.c
reference to gen_macho_*_di.  The patch should have been tested on other
PowerPC configurations.

	There are a number of problems with the patch and it should not
have been committed.  Regardless whether the patterns are suppose to be
Darwin-specific, they have effects on other configurations, as you have
seen, so they should not be approved as "Darwin" only.

	As Andreas has pointed out, the patterns that invoke output_call()
must have some other return value or abort() in the non-TARGET_MACHO
case. 

	match_parallel with a predicate of "any_operand" now is wrong.

	And the match_parallel patterns appear to be generating RTL that
is unrecognized by lmw patterns in rs6000.md as seen by ppclinux32 and
aix32.

David