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emit-rtl.c patch to copy RTX_FRAME_RELATED_P

This fixes PR 18010, which is an IA-64 unwind problem turned up by the
libunwind testsuite.

When basic block reordering copies instructions around, it does not copy
the RTX_FRAME_RELATED_P bit.  This causes us to lose unwind info when
epilogues are duplicated.  This is primarily a problem for IA-64, as
most DWARF2 unwinders don't bother to instrument epilogue instructions. 
This is required by the IA-64 unwind API though.

This was tested with an x86_64-linux bootstrap and make check.  There
were no regressions.  This was also tested with an ia64-linux bootstrap
and make check.  There were two extra libjava passes, though I am not
sure why.  The libunwind author confirms that this solves his problems. 
I have checked in the patch.
-- 
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com

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