Add mir-opt test for derived PartialEq and PartialOrd

Author: tmiasko

src/test/mir-opt/partial.rs

@@ -0,0 +1,13 @@
+// compile-flags: --crate-type=lib -Copt-level=0 -Zmir-opt-level=1
+
+// EMIT_MIR partial.{impl#1}-eq.LowerIntrinsics.diff
+// EMIT_MIR partial.{impl#1}-eq.CopyPropagation.diff
+// EMIT_MIR partial.{impl#1}-eq.PreCodegen.before.mir
+// EMIT_MIR partial.{impl#2}-partial_cmp.LowerIntrinsics.diff
+// EMIT_MIR partial.{impl#2}-partial_cmp.CopyPropagation.diff
+// EMIT_MIR partial.{impl#2}-partial_cmp.PreCodegen.before.mir
+#[derive(PartialEq, PartialOrd)]
+pub enum E {
+    A,
+    B,
+}