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

@@ -1,5 +1,9 @@
--- [E007] Type Mismatch Error: tests/neg/i6762.scala:5:72 --------------------------------------------------------------
-5 |def f(word: String)(given QuoteContext): Expr[Foo[G[String]]] = '{Foo(${word.toExpr})} // error
-  |                                                                        ^^^^
-  |                                                                        Found:    quoted.Expr[String]
-  |                                                                        Required: quoted.Expr[G[String]]
+-- [E007] Type Mismatch Error: tests/neg/i6762.scala:5:77 --------------------------------------------------------------
+5 |def f(word: String)(given QuoteContext): Expr[Foo[G[String]]] = '{Foo(${Expr(word)})} // error // error
+  |                                                                             ^^^^
+  |                                                                             Found:    (word : String)
+  |                                                                             Required: G[String]
+-- Error: tests/neg/i6762.scala:5:82 -----------------------------------------------------------------------------------
+5 |def f(word: String)(given QuoteContext): Expr[Foo[G[String]]] = '{Foo(${Expr(word)})} // error // error
+  |                                                                                  ^
+  |ambiguous implicit arguments: both method CharIsLiftable in object Liftable and method ByteIsLiftable in object Liftable match type quoted.Liftable[G[String]] of parameter evidence$1 of method apply in object Expr

library/src-non-bootstrapped/scala/tasty/reflect/TreeUtils.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