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Automatically use the ELFv2 ABI on powerpc64 if supported by the compiler.

Description

Automatically use the ELFv2 ABI on powerpc64 if supported by the compiler.
This has the same effects on DDB working as -mcall=aixdesc, but also is
supported by clang and marginally improves kernel performance.

MFC after: 2 weeks

Details

Provenance
nwhitehornAuthored on
Parents
rS326201: IFC @ r326200
Branches
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