public RegisterSpecSet getStarts(int label) {
    RegisterSpecSet result = getStarts0(label);

    return (result != null) ? result : emptySet;
  }
Gets the register set associated with the start of the block with the given label. This returns
an empty set with the appropriate max size if no set was associated with the block in question.

@param label {@code >= 0;} the block label
@return {@code non-null;} the associated register set
android/android_framework/dex-maker/src/main/java/com/android/dx/rop/code/LocalVariableInfo.java