public SFormsFastMapDirect getIfFalse() {
    ValidationHelper.assertTrue(
      this.ifTrue != null && this.ifTrue != this.ifFalse,
      "VarMapHolder is in an illegal state");
    return this.ifFalse == null ? this.ifTrue : this.ifFalse;
  }
Gets the variable map for the related expression, in case it is false.
The caller should not mutate this map unless
`makeFullyMutable()` has been called or `isNormal()` returned false.
src/org/jetbrains/java/decompiler/modules/decompiler/sforms/VarMapHolder.java