Amy Kwan c35ca3a1c7 [PowerPC] Implement XL compat __fnabs and __fnabss builtins. ...

This patch implements the following floating point negative absolute value
builtins that required for compatibility with the XL compiler:
```
double __fnabs(double);
float __fnabss(float);
```

These builtins will emit :
- fnabs on PWR6 and below, or if VSX is disabled.
- xsnabsdp on PWR7 and above, if VSX is enabled.

Differential Revision: https://reviews.llvm.org/D125506

2022-05-19 11:28:40 -05:00

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