Retval is not a reserved keyword, fixes 643345

mcs/ilasm/parser/ILParser.jay

@@ -305,7 +305,7 @@ namespace Mono.ILASM {
 %token K_OUT
 %token K_OPT
 // %token K_LCID
-%token K_RETVAL
+//%token K_RETVAL
 %token K_STATIC
 %token K_PUBLIC
 %token K_PRIVATE

mcs/ilasm/scanner/ILTables.cs

@@ -143,7 +143,7 @@ namespace Mono.ILASM {
                                 keywords ["opt"] = new ILToken (Token.K_OPT, "opt");
                                 // Not a keyword according to ilasm 1.1
                                 // keywords ["lcid"] = new ILToken (Token.K_LCID, "lcid");
-                                keywords ["retval"] = new ILToken (Token.K_RETVAL, "retval");
+                                //keywords ["retval"] = new ILToken (Token.K_RETVAL, "retval");
                                 keywords ["static"] = new ILToken (Token.K_STATIC, "static");
                                 keywords ["public"] = new ILToken (Token.K_PUBLIC, "public");
                                 keywords ["private"] = new ILToken (Token.K_PRIVATE, "private");