Add support for the loop operator

src/de/inetsoftware/jwebassembly/binary/BinaryModuleWriter.java

@@ -656,6 +656,10 @@ public class BinaryModuleWriter extends ModuleWriter implements InstructionOpcod
                     codeStream.writeVaruint32( i );
                 }
                 break;
+            case LOOP:
+                codeStream.write( LOOP );
+                codeStream.write( 0x40 ); // void; the return type of the loop. currently we does not use it
+                break;
             default:
                 throw new Error( "Unknown block: " + op );
         }

src/de/inetsoftware/jwebassembly/module/WasmBlockOperator.java

@@ -32,4 +32,5 @@ public enum WasmBlockOperator {
     BR,
     BR_IF,
     BR_TABLE,
+    LOOP,
 }

src/de/inetsoftware/jwebassembly/text/TextModuleWriter.java

@@ -289,6 +289,10 @@ public class TextModuleWriter extends ModuleWriter {
                 }
                 name = builder.toString();
                 break;
+            case LOOP:
+                name = "loop";
+                insetAfter++;
+                break;
             default:
                 throw new Error( "Unknown block: " + op );
         }