fma refactor 1/3: remove math/fma.rs

Done in stages so git tracks the moved file correctly.

library/compiler-builtins/libm/src/math/fma.rs

@@ -1,40 +0,0 @@
-/// Fused multiply add (f64)
-///
-/// Computes `(x*y)+z`, rounded as one ternary operation (i.e. calculated with infinite precision).
-#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
-pub fn fma(x: f64, y: f64, z: f64) -> f64 {
-    return super::generic::fma(x, y, z);
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    #[test]
-    fn fma_segfault() {
-        // These two inputs cause fma to segfault on release due to overflow:
-        assert_eq!(
-            fma(
-                -0.0000000000000002220446049250313,
-                -0.0000000000000002220446049250313,
-                -0.0000000000000002220446049250313
-            ),
-            -0.00000000000000022204460492503126,
-        );
-
-        let result = fma(-0.992, -0.992, -0.992);
-        //force rounding to storage format on x87 to prevent superious errors.
-        #[cfg(all(target_arch = "x86", not(target_feature = "sse2")))]
-        let result = force_eval!(result);
-        assert_eq!(result, -0.007936000000000007,);
-    }
-
-    #[test]
-    fn fma_sbb() {
-        assert_eq!(fma(-(1.0 - f64::EPSILON), f64::MIN, f64::MIN), -3991680619069439e277);
-    }
-
-    #[test]
-    fn fma_underflow() {
-        assert_eq!(fma(1.1102230246251565e-16, -9.812526705433188e-305, 1.0894e-320), 0.0,);
-    }
-}