print FP values as integers

to avoid rust-lang/compiler-builtins#79

Author: Jorge Aparicio

examples/fpu.rs

@@ -13,7 +13,11 @@ pub extern "C" fn main() -> ! {
     let y = black_box(3_f32);
     let z = black_box(x * y);
 
-    iprintln!("{} * {} = {}", x, y, z);
+    // FIXME(japaric/rustc-builtins#79) there is a problem with the
+    // rustc-builtins (compiler-builtins-snapshot) crate and LTO. Avoid the
+    // issue by printing these values as integers because integer formatting
+    // doesn't need any intrinsic.
+    iprintln!("{} * {} = {}", x as u32, y as u32, z as u32);
 
     loop {}
 }