Enable DSLList as default

This likely involves an increase in compilation time, since the list
needs to be generated from the tree before compiling.

Author: natecook1000

Sources/_StringProcessing/Compiler.swift

@@ -32,6 +32,10 @@ class Compiler {
   }
 
   __consuming func emit() throws -> MEProgram {
+    try emitViaList()
+  }
+  
+  __consuming func emitViaTree() throws -> MEProgram {
     // TODO: Handle global options
     var codegen = ByteCodeGen(
       options: options,

Tests/RegexTests/MatchTests.swift

@@ -41,7 +41,7 @@ func _validateListCompilation<T>(
   _ regex: Regex<T>
 ) throws -> Bool {
   let treeCompiler = Compiler(tree: regex.program.tree)
-  let treeProgram = try treeCompiler.emit()
+  let treeProgram = try treeCompiler.emitViaTree()
   let listCompiler = Compiler(tree: regex.program.tree)
   let listProgram = try listCompiler.emitViaList()
   return treeProgram.instructions == listProgram.instructions