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e0e6243b21
Since there are more platforms that do not have symbols present, we need to use `rustc_apfloat` for more conversion tests. Make use of the fallback like other tests, and refactor so each test gets its own function. Previously we were testing both apfloat and system conversion methods when possible. This changes to only test one or the other, depending on whether or not the system version is available. This seems reasonable because it is consistent with all other tests, but we should consider updating all tests to check both at some point. This also includes an adjustment of PowerPC configuration to account for the linking errors at [1]. [1]: https://github.com/rust-lang/compiler-builtins/issues/655