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[PowerPC] The __float128 type should only be available on Power9

Authored by stefanp on Jun 13 2018, 9:05 AM.

Description

[PowerPC] The __float128 type should only be available on Power9

Diasble the use of the type __float128 for PPC machines older
than Power9.

The use of -mfloat128 for PPC machine older than Power9 will result
in an error.

Differential Revision: https://reviews.llvm.org/D48088

llvm-svn: 334613

Details