Added a few optimizer tests for Verbatim

test/libyul/yulOptimizerTests/loadResolver/verbatim_mload.yul

@@ -0,0 +1,16 @@
+{
+    mstore(10, 20)
+    // cannot be resolved because of verbatim
+    sstore(0, mload(10))
+    verbatim_0i_0o("test")
+}
+// ----
+// step: loadResolver
+//
+// {
+//     let _1 := 20
+//     let _2 := 10
+//     mstore(_2, _1)
+//     sstore(0, mload(_2))
+//     verbatim_0i_0o("test")
+// }

test/libyul/yulOptimizerTests/loadResolver/verbatim_sload.yul

@@ -0,0 +1,21 @@
+{
+    sstore(10, 20)
+    // will be resolved
+    sstore(30, sload(10))
+    verbatim_0i_0o("test")
+    // will not be resolved
+    sstore(30, sload(10))
+}
+// ----
+// step: loadResolver
+//
+// {
+//     let _1 := 20
+//     let _2 := 10
+//     sstore(_2, _1)
+//     let _4 := _1
+//     let _5 := 30
+//     sstore(_5, _4)
+//     verbatim_0i_0o("test")
+//     sstore(_5, sload(_2))
+// }