[PATCH] rs6000: Fix MMA API - Add support for compatibility built-ins

[Florian Weimer]

* Peter Bergner:

> On 2/5/21 4:28 AM, Florian Weimer wrote:
>> * Peter Bergner via Gcc-patches:
>> 
>>> The LLVM and GCC teams agreed to rename the __builtin_mma_assemble_pair and
>>> __builtin_mma_disassemble_pair built-ins to __builtin_vsx_assemble_pair and
>>> __builtin_vsx_disassemble_pair respectively.  It's too late to remove the
>>> old names, so this patch adds support for creating compatibility built-ins
>>> (ie, multiple built-in functions generate the same code) and then creates
>>> compatibility built-ins using the new names.
>> 
>> Maybe add a check that the compatibility builtins are flagged as
>> availble using __has_builtin?
>
> Do you mean add a test in the testsuite for this?  I can check on
> adding that to the test case.

Right, in the test case.  Given that it's a new kind of built-in.
(Not sure if it makes sense.)

Thanks,
Florian
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