[pypy-dev] PPC64 JIT test_ppc.py tests fixed and working

[David Edelsohn]

Sven,

With the attached patch, all of the ppc/ppcgen/test/test_ppc.py tests
pass except for test_call_function that I skip while I debug it.

I updated ppc_assembler.py:load_from() to load a full 64 bit value on
64 bit systems.  It is not exactly right because I need to fix the
signed offset compensation code, but it allows the test to pass.

The multiply tests were failing because the tests perform a signed
comparison and the result of PPC 32 bit multiply instructions are not
implicitly sign extended.  I sign extend the results on PPC64 and they
now pass.

test_load_and_store needs to use load_dword on PPC64 to load the
addresses into r8 and r9.

test_ld needs to allocate a 64 bit long, not a 32 bit int, and the
address needs to be loaded with load_dword.

Thanks, David
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