Implement cbrt and hypot function calls

Test cases are added to `tests/run-pass/intrinsics-math.rs`

src/fn_call.rs

@@ -560,6 +560,17 @@ pub trait EvalContextExt<'a, 'mir, 'tcx: 'a + 'mir>: crate::MiriEvalContextExt<'
                 let n = this.memory().get(ptr.alloc_id)?.read_c_str(tcx, ptr)?.len();
                 this.write_scalar(Scalar::from_uint(n as u64, dest.layout.size), dest)?;
             }
+            "cbrt" => {
+                let f = this.read_scalar(args[0])?.to_f64()?;
+                let n = f.cbrt();
+                this.write_scalar(Scalar::from_f64(n), dest)?;
+            }
+            "_hypot" | "hypot" => {
+                let f1 = this.read_scalar(args[0])?.to_f64()?;
+                let f2 = this.read_scalar(args[1])?.to_f64()?;
+                let n = f1.hypot(f2);
+                this.write_scalar(Scalar::from_f64(n), dest)?;
+            }
 
             // Some things needed for `sys::thread` initialization to go through.
             "signal" | "sigaction" | "sigaltstack" => {

tests/run-pass/intrinsics-math.rs

@@ -64,4 +64,7 @@ pub fn main() {
 
     assert_approx_eq!(0.1f32.trunc(), 0.0f32);
     assert_approx_eq!((-0.1f64).trunc(), 0.0f64);
+
+    assert_approx_eq!(27f64.cbrt(), 3.0f64);
+    assert_approx_eq!(3f64.hypot(4f64), 5.0f64);
 }