[tuples] Fix more regressions and ppc64 builds

[Diego Novillo]

This patch fixes 125 regressions and the ppc64 backend:

- Adds some #if 0 in init_optimization_passes that were executing
unconverted code.  On ppc64 this was giving random failures.  This
causes 3 new regressions in the C testsuite because we don't recognize
the -fdump-tree-useless.  This will be fixed by Bill's patch to enable
this pass.

- It removes several calls to gimple_unreachable in parts that are
already converted.

- It tuplifies the ppc64 backend.


Tested on x86_64 and ppc64.


Diego.
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