MIPS: Fix KeyedStoreStubCompiler::GenerateStoreFastDoubleElement()

MIPS: Fix KeyedStoreStubCompiler::GenerateStoreFastDoubleElement()

Test regress-91013.js (to ensure that the stored value was returned) passed on mips
without this fix, since the input value (in value_reg, a0) also happens to be in
mips return value register v0 at the time of call.

But it is fragile to depend on that behavior, so an explicit move from a0 to v0
is warranted. This fix puts that move in the delay slot of the Ret().

Patch by Paul Lind.

BUG=
TEST=

Committed: http://code.google.com/p/v8/source/detail?r=9035

[Paul Lind, 2011-08-29 06:13:37]

Vyacheslav, this relates to an old commit of yours, r8781, and the mips port of
that in r8801. Thanks.

[Vyacheslav Egorov (Chromium), 2011-08-29 08:58:20]

LGTM

Thanks Paul! I'll land.