testsuite: add 'std-' prefix to c++ analyzer test cases

gcc/testsuite/ChangeLog:
	* g++.dg/analyzer/unique_ptr-1.C: Rename to...
	* g++.dg/analyzer/std-unique_ptr-1.C: ...this.
	* g++.dg/analyzer/unique_ptr-2.C: Rename to...
	* g++.dg/analyzer/std-unique_ptr-2.C: ...this.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>

diff --git a/gcc/testsuite/g++.dg/analyzer/unique_ptr-1.C b/gcc/testsuite/g++.dg/analyzer/std-unique_ptr-1.C
similarity index 100%
rename from gcc/testsuite/g++.dg/analyzer/unique_ptr-1.C
rename to gcc/testsuite/g++.dg/analyzer/std-unique_ptr-1.C

diff --git a/gcc/testsuite/g++.dg/analyzer/unique_ptr-2.C b/gcc/testsuite/g++.dg/analyzer/std-unique_ptr-2.C
similarity index 100%
rename from gcc/testsuite/g++.dg/analyzer/unique_ptr-2.C
rename to gcc/testsuite/g++.dg/analyzer/std-unique_ptr-2.C