[PATCH, PPC/Darwin] Fix long double symbol exports.

[Jonathan Wakely]

On 06/12/18 14:36 -0800, Mike Stump wrote:
>On Dec 6, 2018, at 11:52 AM, Iain Sandoe <iain@sandoe.co.uk> wrote:
>>
>> During 8.x, the rs6000 target-specific mangling was reorganised which uncovered
>> a long-standing bug in Darwin’s mangling for ‘IBM’ long double.  Now the symbols
>> are correctly mangled, and we end up with a bunch of test link fails.
>>
>> This patch adds the necessary subset of the Linux long double exports to Darwin’s
>> export table.
>>
>> I have tested this on a few bootstrap/regtest cycles on powerpc-darwin9, and on the
>> power7 linux system.
>>
>> For the record, I’ve noted the library versions from the Linux side, although Darwin
>> does not version symbols in this way.
>>
>> OK for trunk and 8.x?
>
>Don't know if the libstdc++ want to review this or they want me to...  I'm fine with it.

Me too. OK for trunk and 8.x - thanks.