[HLSL] Add experimental_constrained_tan intrinsic

[farzonl]

We want to do the same thing that cos\sin do in the below examples:

  case Builtin::BI__builtin_cos:
  case Builtin::BI__builtin_cosf:
  case Builtin::BI__builtin_cosf16:
  case Builtin::BI__builtin_cosl:
  case Builtin::BI__builtin_cosf128:
    return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E,
                                 Intrinsic::cos,
                                 Intrinsic::experimental_constrained_cos));
  
  case Builtin::BI__builtin_sin:
  case Builtin::BI__builtin_sinf:
  case Builtin::BI__builtin_sinf16:
  case Builtin::BI__builtin_sinl:
  case Builtin::BI__builtin_sinf128:
    return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E,
                                 Intrinsic::sin,
                                 Intrinsic::experimental_constrained_sin));

Originally posted by @farzonl in #90276 (comment)