Re-enable dex2oat_test copying dex test case for target

Also clean up some comments.

Bug: 70934104
Test: mm test-art-target-gtest-dex2oat_test -j64
Test: mm test-art-host-gtest-dex2oat_test -j64

Change-Id: I8b42848a85644e265ef7392c601757ee9ffa6157
diff --git a/dex2oat/dex2oat_test.cc b/dex2oat/dex2oat_test.cc
index 12cfd24..6d3658f 100644
--- a/dex2oat/dex2oat_test.cc
+++ b/dex2oat/dex2oat_test.cc
@@ -1850,23 +1850,25 @@
   GenerateOdexForTest(dex_location,
                       odex_location,
                       CompilerFilter::Filter::kQuicken,
-                      { "--dump-timings", "--dm-file=" + dm_file.GetFilename() },
+                      { "--dump-timings",
+                        "--dm-file=" + dm_file.GetFilename(),
+                        // Pass -Xuse-stderr-logger have dex2oat output in output_ on target.
+                        "--runtime-arg",
+                        "-Xuse-stderr-logger" },
                       true,  // expect_success
                       false,  // use_fd
                       [](const OatFile& o) {
                         CHECK(o.ContainsDexCode());
                       });
-  if (!kIsTargetBuild) {
-    // The output_ variable is not correctly set for target, TODO: investigate.
-    std::istringstream iss(output_);
-    std::string line;
-    bool found_fast_verify = false;
-    const std::string kFastVerifyString = "Fast Verify";
-    while (std::getline(iss, line) && !found_fast_verify) {
-      found_fast_verify = found_fast_verify || line.find(kFastVerifyString) != std::string::npos;
-    }
-    EXPECT_TRUE(found_fast_verify) << "Expected to find " << kFastVerifyString << "\n" << output_;
+  // Check the output for "Fast verify", this is printed from --dump-timings.
+  std::istringstream iss(output_);
+  std::string line;
+  bool found_fast_verify = false;
+  const std::string kFastVerifyString = "Fast Verify";
+  while (std::getline(iss, line) && !found_fast_verify) {
+    found_fast_verify = found_fast_verify || line.find(kFastVerifyString) != std::string::npos;
   }
+  EXPECT_TRUE(found_fast_verify) << "Expected to find " << kFastVerifyString << "\n" << output_;
 }
 
 }  // namespace art