Update for upstream changes: rust-lang/rust#43554

Author: dwrensha

src/eval_context.rs

@@ -196,8 +196,8 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
         let primval = match *const_val {
             Integral(const_int) => PrimVal::Bytes(const_int.to_u128_unchecked()),
 
-            Float(ConstFloat::F32(f)) => PrimVal::from_f32(f),
-            Float(ConstFloat::F64(f)) => PrimVal::from_f64(f),
+            Float(ConstFloat { ty: ast::FloatTy::F32, bits }) => PrimVal::Bytes(bits),
+            Float(ConstFloat { ty: ast::FloatTy::F64, bits }) => PrimVal::Bytes(bits),
 
             Bool(b) => PrimVal::from_bool(b),
             Char(c) => PrimVal::from_char(c),