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ppc: support 32bit AIX and OSX #211

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ppc: support 32bit AIX and OSX #211

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Commits on Oct 3, 2023

  1. ppc: support 32bit AIX and OSX 

    Since c0270dc (Support floating point arguments by more ABIs., 2017-10-21)
tests had been failing in 32bit AIX, because the ABI it uses is slightly
different than the one implemented.

Reuse the 64bit implementation for 32bit AIX, but add the ability to skip
two 32bit general registers for each 64bit floating point argument.

To support a fourth argument when all three previous ones are doubles
r9 had to be make accessible as a scratch register, so add r11 to replace it
as TMP_REG1, with the caveat it might be clobbered by inter module calls.
    @carenas
    carenas committed Oct 3, 2023
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