final boolean isForbidden(OPT_Register symb, OPT_Register phys) { if (VM.VerifyAssertions) { VM.assert(symb != null); VM.assert(phys != null); } RestrictedRegisterSet s = getRestrictions(symb); if (s == null) return false; return s.contains(phys); }
  final boolean allVolatilesForbidden(OPT_Register symb) {    if (VM.VerifyAssertions) {      VM.assert(symb != null);    }    RestrictedRegisterSet s = getRestrictions(symb);    if (s == null) return false;    return s.getNoVolatiles();  }  /**   * Is it forbidden to assign symbolic register symb to physical register   * phys?   */  final boolean isForbidden(OPT_Register symb, OPT_Register phys) {    if (VM.VerifyAssertions) {      VM.assert(symb != null);      VM.assert(phys != null);    }    RestrictedRegisterSet s = getRestrictions(symb);    if (s == null) return false;    return s.contains(phys);  }