Redundant RETURN instruction in Enum constructor

The bytecode generated for Enum constructors has a redundant RETURN instruction at the end.

Minimal test case:

enum A5 {
    A5_1 { int value = -1; }
}

The following bytecode is generated (note the double RETURN):

  public A5(java.lang.String, int, A5$2) throws ;
    flags: ACC_PUBLIC
    Code:
      stack=3, locals=5, args_size=4
         0: aload_0       
         1: aload_1       
         2: iload_2       
         3: invokespecial #42                 // Method "<init>":(Ljava/lang/String;I)V
         6: return        
         7: return        
      LineNumberTable:
        line 0: 6
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
               0       8     0  this   LA5;
               0       8     1    p0   Ljava/lang/String;
               0       8     2    p1   I
               0       8     3    p2   LA5$2;
    Exceptions:
      throws 
    Synthetic: true

This is a minor bytecode problem, but a blocker for stack map frames.

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