Improve debuggability for compiler crash when using tasty reflect

[liufengyun]

Given the following macro:

import scala.tasty._
import scala.quoted._

inline def foo(x: Int): Int = ${ fooImpl('x) }

def fooImpl(x: Expr[Int])(implicit refl: Reflection) = {
  import refl._
  import util._

  val t1 : Term = x.unseal
  let (t1) { v =>
    let ('{ "hello" }.unseal) { y =>
      Select.overloaded(v, ">", Nil, y :: Nil)
    }
  }.seal.cast[Int]
}

Without the change, we get an error message like the following:

1 |def test(x: Int) = foo(x)
  |                   ^^^^^^
  |An exception occurred while executing macro expansion
  |assertion failed: no overloads available for > on Int with targs: ; args: x of types rhsTpe$_$1(x); expectedType: ?.all alternatives: def >(x: Double): Boolean, def >(x: Float): Boolean, def >(x: Long): Boolean, def >(x: Int): Boolean, def >(x: Char): Boolean, def >(x: Short): Boolean, def >(x: Byte): Boolean

With the change, mysterious type rhsTpe$_$1(x) is replaced with the type String.