[PATCH, libstdc++] Update abi-check MIPS64 baselines for 4.4

[Adam Nemet]

I of course meant MIPS64 baselines.

Adam Nemet <anemet@caviumnetworks.com> writes:
> This updates the n32 baseline and adds the new n64 baseline.  OK for 4.4 and
> trunk?
>
> Adam
>
> 	* config/abi/post/mips64-linux-gnu/baseline_symbols.txt:
> 	Regenerate.
> 	* config/abi/post/mips64-linux-gnu/64/baseline_symbols.txt: New
> 	file.