Move bench tests to bootstrapped only

The macros in the bench tests will compile in bootstrapped compiler.

Author: liufengyun

compiler/test/dotty/tools/dotc/BootstrappedOnlyCompilationTests.scala

@@ -33,6 +33,7 @@ class BootstrappedOnlyCompilationTests extends ParallelTesting {
   @Test def posMacros: Unit = {
     implicit val testGroup: TestGroup = TestGroup("compilePosMacros")
     aggregateTests(
+      compileFilesInDir("tests/bench", defaultOptions),
       compileFilesInDir("tests/pos-macros", defaultOptions),
       compileFilesInDir("tests/pos-custom-args/semanticdb", defaultOptions.and("-Ysemanticdb")),
     ).checkCompile()

compiler/test/dotty/tools/dotc/CompilationTests.scala

@@ -49,7 +49,6 @@ class CompilationTests extends ParallelTesting {
       compileFilesInDir("tests/pos-scala2", scala2CompatMode),
       compileFilesInDir("tests/pos-custom-args/erased", defaultOptions.and("-Yerased-terms")),
       compileFilesInDir("tests/pos", defaultOptions),
-      compileFilesInDir("tests/bench", defaultOptions),
       compileFilesInDir("tests/pos-deep-subtype", allowDeepSubtypes),
       compileFile(
         // succeeds despite -Xfatal-warnings because of -nowarn