Add round_ties_even to f32 and f64

compiler/rustc_codegen_gcc/src/intrinsic/mod.rs

@@ -68,6 +68,8 @@ fn get_simple_intrinsic<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, name: Symbol) ->
         sym::nearbyintf64 => "nearbyint",
         sym::roundf32 => "roundf",
         sym::roundf64 => "round",
+        sym::roundevenf32 => "roundevenf",
+        sym::roundevenf64 => "roundeven",
         sym::abort => "abort",
         _ => return None,
     };