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PowerPC mishandles xscmpudp instruction
Description of problem:
xscmpudp instruction is mishandled
Steps to reproduce:
1. Compile the attached program with VSX (e.g. `RUSTFLAGS=-Ctarget-feature=+vsx cargo build --target=powerpc64-unknown-linux-gnu`)
2. Run the program and expect assertions to pass.
3. See assertions fail.
Additional information:
When VSX is disabled, the `fcmpu` instruction is emitted instead (and handled properly). See the offending program:
```
pub fn main() {
use std::hint::black_box;
assert!(black_box(f64::NAN)
.clamp(black_box(0f64), black_box(0f64))
.is_nan());
}
```
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