[patch, testsuite] require target lto in gcc.dg/tm/lto-1.c

[Greta Yorsh]

The new test gcc.dg/tm/lto-1.c fails in configurations where lto support is
disabled. 

This patch adds the missing target requirement to the test:
/* { dg-require-effective-target lto } */

Checked on qemu for arm-none-eabi configured with and without --disable-lto.

gcc/testsuite/ChangeLog

2012-01-25  Greta Yorsh  <Greta.Yorsh@arm.com>

	* gcc.dg/tm/lto-1.c: Require lto support in target.
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