fixup! Add support for f128 integer exponentiation

Author: tgross35

testcrate/tests/float_pow.rs

@@ -68,3 +68,11 @@ pow! {
 pow! {
     f128, 1e-36, __powikf2, not(feature = "no-sys-f128");
 }
+
+// FIXME(f16_f128): MSVC is unable to link the mul and div symbols required for this test.
+
+#[no_mangle]
+#[cfg(target_env = "msvc")]
+pub extern "C" fn __divtf3(a: f128, b: f128) -> f128 {
+    compiler_builtins::float::div::__divtf3(a, b)
+}