[PATCH][testsuite] Require shared effective target for some lto.exp tests

[Kyrill Tkachov]

Hi all,

The tests in this patch fail for me on aarch64-none-elf with:
relocation R_AARCH64_ADR_PREL_PG_HI21 against external symbol `_impure_ptr' can not be used when making a shared object; recompile with -fPIC

I believe since the tests pass -shared to the linker they should be gated on the 'shared' effective target?
With this patch these tests appear as UNSUPPORTED on aarch64-none-elf rather than FAILing.

Ok for trunk?

Thanks,
Kyrill

2016-01-24  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * gcc.dg/lto/pr54709_0.c: Require 'shared' effective target.
     * gcc.dg/lto/pr61526_0.c: Likewise.
     * gcc.dg/lto/pr64415_0.c: Likewise.
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