[lto] Spurious failures in lto tests with -jN

[Ben Elliston]

> I've noticed some spurious failures in the lto tests (g++.dg/lto and
> gcc.dg/lto).  They only occur with -jN.  The symptom is an error
> message from ld complaining that a .lto.ltrans.o file is missing.  I
> think this is a bug in the lto.exp script because the tests work fine
> with -j1.

I assume you mean when running make -jN check-gcc?  Concurrency between
various .exp scripts should not cause you any problems, as each make
check is run in its own testsuite directory.

Ben