libgcc2.c (__eh_ffetmnpc): Add support for machines that cannot access globals after throw's epilogue when...

	* libgcc2.c (__eh_ffetmnpc): Add support for machines that cannot
	access globals after throw's epilogue when -fno-sjlj-exceptions is
	used.
	* rs6000.c (DONT_ACCESS_GBLS_AFTER_EPILOGUE): Likewise.
	* mips.h (DONT_ACCESS_GBLS_AFTER_EPILOGUE): Likewise.
	(INITIAL_ELIMINATION_OFFSET): Fix RETURN_ADDRESS_POINTER_REGNUM
	for 64 bit words, with 32 bit pointers and variable endianness.
Fixes throwing across shared library lines (useful at times on mips and rs6000)

From-SVN: r14168