library: move files that no longer require bootstrapped compiler

Some of them had been sitting here for a long time to work around issues
with -sourcepath which should all be fixed now.

Also remove non-bootstrapped toExpr which had been deprecated for a while.

Author: smarter

library/src-bootstrapped/scala/quoted/package.scala

@@ -2,4 +2,4 @@ import scala.quoted.{_, given}
 
 type G[X]
 case class Foo[T](x: T)
-def f(word: String)(given QuoteContext): Expr[Foo[G[String]]] = '{Foo(${word.toExpr})} // error
+def f(word: String)(given QuoteContext): Expr[Foo[G[String]]] = '{Foo(${Expr(word)})} // error // error