more general multi-file testing support for FDO

[Xinliang David Li]

I need this support for LIPO but it might be also useful for trunk.
The support is 'borrowed' from lib/lto.exp.  I have tested with it and
it works fine. The only limitation is for any subdirectory with a
multi-source test case, all the other single source test case need
also to follow the same naming standard, i.e., named as xxxx_0.c.  The
current FDO test under gcc.dg/tree-prof works as it is without any
changes.

Thanks,

David
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