[tree-ssa] new -Wuninitialized warning

[Jason Merrill]

After I apply this patch to cp/pt.c, bootstrap fails with a warning about
expr_type possibly being used uninitialized.  This turns out to be because
DCE is discarding the initial initialization of expr_type.  This isn't
actually a bug, since ssa->normal seems to be properly inserting
initializations along all paths to uses, but it seems that the RTL flow
graph isn't clever enough to realize that.

I ran into this by way of a patch I've been working on to evaluate
expressions into formal temps before assigning them to user vars, so as to
expose more expressions to redundancy elimination.

Thoughts?
Jason

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