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[PowerPC] Fix stack padding issue on ppc32.

Description

[PowerPC] Fix stack padding issue on ppc32.

Four bytes of padding are needed in the regular powerpc case to bring the
stack frame size up to a multiple of 16 bytes to meet ABI requirements.

Fixes odd hangs I was encountering during testing.

Details

Provenance
bdragonAuthored on
Parents
rS355046: cxgbe(4): Update the firmware interface header.
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