compiler, runtime, common: Support (in)out Parameters

When a function is called, if there is an (in)out parameter,
make sure that updated values are propogated to the calling
function.

Signed-off-by: Will Hawkins <hawkinsw@obs.cr>

Sources/P4Compiler/Common.swift

@@ -83,8 +83,8 @@ func parameter_list_compiler(
 
   // Otherwise, there should be one parameter left!
   switch Parameter.Compile(node: currentChild!, withContext: context) {
-  case .Ok(let (vds, updated_context)):
-    return Result.Ok((parameters.addParameter(vds), updated_context))
+  case .Ok(let (parsed_parameter, updated_context)):
+    return Result.Ok((parameters.addParameter(parsed_parameter), updated_context))
   case .Error(let e): return Result.Error(e)
   }
 }

Sources/P4Compiler/Statement.swift

@@ -312,7 +312,7 @@ extension ReturnStatement: CompilableStatement {
 
     return switch Expression.Compile(node: expression_node, withContext: context) {
     case .Ok(let result):
-      if result.type().eq(context.expected_type!) {
+      if result.type().dataType().eq(rhs: context.expected_type!.dataType()) {
         .Ok((ReturnStatement(result), context))
       } else {
         .Error(