Turn on semantic tests for the old codegen where possible

These were marked IR-only, but they do pass on the old codegen too.

Also add old codegen version of semantictests/revertStrings/function_entry_checks.

test/libsolidity/semanticTests/array/copying/array_copy_clear_storage_packed.sol

@@ -39,7 +39,7 @@ contract C {
     }
 }
 // ====
-// compileViaYul: true
+// compileViaYul: also
 // ----
 // f() -> 0
 // g() -> 0