[PATCH] Set properties of f128 type

[Akira Hatanaka]

This patch sets properties of f128 type in
TargetLoweringBase::computeRegisterProperties. This is needed to enable
soft-float on architectures which have support for f128. mips64 is an
example of such an architecture. aarch64 also supports f128, but it doesn't
need this because it doesn't have a soft-float ABI.

Please review.
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