[PATCH] Speedup gij/libjava loading on darwin

[Andrew Pinski <pinskia at physics dot uc dot edu>]

On Darwin, libjava testing takes for ever.  The issue is that loading 
gij (and
the native programs) is slow and most of the time is spent dyld (the 
dynamic
loader, like ld.so).  If we link with -single_module, the issue goes 
away
because the dynamic loader have less symbols to resolve at load time.

I stole the code in libobjc and libgfortran which I wrote to fix 
implement this.

OK? Bootstrapped and tested on powerpc-darwin with no regressions.

Oh and testing libjava takes now 2.5 hours instead of 4 hours or so.

Thanks,
Andrew Pinski

ChangeLog:

	* Makefile.am (extra_ldflags_libjava): New variable to
	substitute in.
	(LIBLINK): Add extra_ldflags_libjava to it.
	* configure.ac (extra_ldflags_libgfortran): Set for *-darwin* to
	"-Wl,-single_module".

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