[PATCH] Test for profiling support (_mcount/gprof)

[Florian Weimer]

The attached patch adds an integration test for gcc -pg, _mcount/gmon,
and gprof.

It passes on aarch64, ppc, ppc64, ppc64le, s390, s390x, x86_64, and on
i386 with the _mcount internal_function replacement applied.

The test is compiled with -pg and is linked against gcrt1.o, via the new
CRT-* makefile hook.  As far as I can tell, it is properly isolated from
system glibc (only GCC objects are picked up).

Thanks,
Florian
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