[vta] fix -auxbase during -fcompare-debug

[Alexandre Oliva]

Since -auxbase is used to compute .gcno and .gcda filenames, it ought
to be the same for both -fcompare-debug compilations.  This patch
arranges for -auxbase-strip or -auxbase to be the same for both
compilations, avoiding a number of testsuite failures in the branch
with GCC_COMPARE_DEBUG=-gtoggle.

I'm installing this in the VTA branch.

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-- 
Alexandre Oliva           http://www.lsd.ic.unicamp.br/~oliva/
You must be the change you wish to see in the world. -- Gandhi
Be Free! -- http://FSFLA.org/   FSF Latin America board member
Free Software Evangelist      Red Hat Brazil Compiler Engineer