[vta] skip debug insns in tree-stdarg

[Alexandre Oliva]

A va_list shouldn't be regarded as escaping just because it's
referenced in a debug insn.  This causes codegen differences.  This
patch fixes all the remaining testsuite regressions on ppc64 and ia64
in the VTA branch, with (and without) -fcompare-debug.  Yay!

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