testsuite: lto: rename tbaa-1 test

This was being ignored previously. Rename it per README.

gcc/testsuite/ChangeLog:

	* gcc.dg/lto/tbaa-1.c: Move to...
	* gcc.dg/lto/tbaa_0.c: ...here.

diff --git a/gcc/testsuite/gcc.dg/lto/tbaa-1.c b/gcc/testsuite/gcc.dg/lto/tbaa_0.c
similarity index 100%
rename from gcc/testsuite/gcc.dg/lto/tbaa-1.c
rename to gcc/testsuite/gcc.dg/lto/tbaa_0.c