[testsuite] Fix g++.dg/debug/dwarf2/thunk1.C (PR debug/53363)

[Rainer Orth]

As described in the PR, g++.dg/debug/dwarf2/thunk1.C was failing on
Solaris/x86 (both 32 and 64-bit), as well as 64-bit Linux/i686.  The
following patch implements Jason's suggestions in the PR.

Tested with the appropriate runtest invocations on i386-pc-solaris2.10,
i686-unknown-linux-gnu, and x86_64-unknown-linux-gnu.

Approved by Jason in the PR, installed on mainline.

	Rainer


2013-02-04  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	PR debug/53363
	* g++.dg/debug/dwarf2/thunk1.C: Restrict to 32-bit x86.
	Add -fno-dwarf2-cfi-asm to dg-options.
	Adapt match count.

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Rainer Orth, Center for Biotechnology, Bielefeld University