[Patch,Fortran] test-case fixes for spu-*-*

[Tobias Burnus]

I intent to commit the following two patches to fix gfortran test suite
failures on spu-unknown-elf. Ken Werner with the the help of Ulrich
Weigand looked at the failures.

a) reassoc_4.f: Ken writes: "This is a known issue. If the testcase
would be compiled with "--param max-completely-peel-times=16", it would
pass." -- Thus I simply have set that value for spu.

b) vect/vect-7.f90: "The testcase requires vect_unpack_float_high and
low to convert int to double which doesn't seem to be implemented on
SPU. We might want to omit this one. Attached is a patch that adds
vect_intfloat_cvt to the target."

There are some other issues which need to be checked more carefully.

Tobias
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