Avoid cc1 SEGV in gcc.dg/rtl/x86_64/final.c (PR target/79975)

[Rainer Orth]

As described in the PR, cc1 SEGVs compiling gcc.dg/rtl/x86_64/final.c on
targets that default to -fno-dwarf2-cfi-asm.  However, the test is
compile-only, so doesn't depend on the toolchain's support for cfi
directives.  Besides, it scans the output for those, so depends on
-fdwarf2-cfi-asm anyway, so I'm adding it explicitly.

Tested with the appropriate runtest invocation on i386-pc-solaris2.11
with as (-fno-dwarf2-cfi-asm default), gas (-fdwarf2-cfi-asm default),
and x86_64-pc-linux-gnu.

Ok for mainline and gcc-7 branch?

	Rainer

-- 
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Rainer Orth, Center for Biotechnology, Bielefeld University


2018-01-31  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	PR target/79975
	* gcc.dg/rtl/x86_64/final.c: Add -fdwarf2-cfi-asm to dg-options.

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