[cfe-dev] add a valgrind option to "make test"

[Sam Bishop]

Attached is a patch which adds a valgrind option to "make test".  The
patch can be merged as-is, but there are a few things I'm unsure about:

o  Why the original "rm $OUTPUT" if something goes wrong?
o  Right now I replace "clang" with "valgrind ... clang".  Should we
introduce a "%clang" instead?  That has pros and cons.

Also, I haven't touched Makefile.parallel.  That should be trivial, though.

Thanks,
Sam
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