[patch][tuples] Convert tree-ssa-reassoc.c to tuples

[Steven Bosscher]

Hi,

Subject says all.  Bootstrapped and tested on ia64-unknown-linux-gnu.

No regressions, but java is only partially tested because the branch
(as-is, unpatched) doesn't build libjava on ia64. So I've done a
non-bootstrap build&tested of java on x86_64. Also no regressions.

OK for the branch?

Gr.
Steven
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