[patch] [tuples] partial merge from trunk

[Rafael Espindola]

This patch merges everything up to but not including the  phiprop
split. I will work on it as soon as this is in.

One of the new tests fails:

gcc.dg/tree-ssa/ipa-reference-1.c scan-tree-dump-times optimized
"conststaticvariable" 0

but there are no regressions.

OK?

Cheers,
-- 
Rafael Avila de Espindola

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