Fix uninitialized variable/field in vectorizer

[Daniel Berlin]

Dorit noticed this one compiling with -ftree-vectorize in the bootstrap
flags on darwin.

I forgot to initialize the subvars field and a variable to NULL in the
vectorizer, causing bad things to happen during garbage collection.

I'll commit this as obvious once bootstrap and regtest finishes on
powerpc-linux and i686-pc-linux-gnu


--Dan
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