[PATCH PR65767]Fix test case failure on arm-none-eabi

[Bin Cheng]

Hi,
As comments at PR65767 and PR65718, we should use namespace other than std
to avoid duplicated definition problem on arm-none-eabi.  This patch fixes
the issue.  It is an obvious change, but I will wait for approval because of
GCC5 branch.

Is it OK?

gcc/testsuite/ChangeLog
2015-04-20  Bin Cheng  <bin.cheng@arm.com>

	PR testsuite/65767
	* g++.dg/lto/pr65276_0.C: Change namespace std to std2.
	* g++.dg/lto/pr65276_1.C: Change namespace std to std2.
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