void setIfFalse(SFormsFastMapDirect ifFalse) {
    if (this.ifTrue == ifFalse) {
      this.ifTrue = null; // go back to normal state
    } else {
      this.ifFalse = ifFalse;
    }
  }
Sets the "ifFalse" variable map to the given map.
src/org/jetbrains/java/decompiler/modules/decompiler/sforms/VarMapHolder.java