Memory leaks in compiler

[Victor Kaplansky]

> When a loop is vectorized, some statements are removed from the basic
> blocks, but the vectorizer information attached to these BBs is never
> freed.  This is because the attached information is freed by walking
> the statements of the basic blocks: see tree-vectorizer.c:1750, but
> the transformed code does not contain all the stmts of the original
> code.  I can't find out a good solution for tracking these stmts, but
> one solution could be to free the stmt_info when the stmts are removed
> from a BB.

Sebastian, thanks for bringing this to our attention. I'll look into this.
I hope that removing stmts from a BB can be easily localized.
-- Victor