chore: checkpoint before Python removal

vendor/libm/src/math/ldexp.rs

@@ -0,0 +1,21 @@
+#[cfg(f16_enabled)]
+#[cfg_attr(assert_no_panic, no_panic::no_panic)]
+pub fn ldexpf16(x: f16, n: i32) -> f16 {
+    super::scalbnf16(x, n)
+}
+
+#[cfg_attr(assert_no_panic, no_panic::no_panic)]
+pub fn ldexpf(x: f32, n: i32) -> f32 {
+    super::scalbnf(x, n)
+}
+
+#[cfg_attr(assert_no_panic, no_panic::no_panic)]
+pub fn ldexp(x: f64, n: i32) -> f64 {
+    super::scalbn(x, n)
+}
+
+#[cfg(f128_enabled)]
+#[cfg_attr(assert_no_panic, no_panic::no_panic)]
+pub fn ldexpf128(x: f128, n: i32) -> f128 {
+    super::scalbnf128(x, n)
+}