VM: Add dart_precompiled build target, a standalone VM without the JIT compiler.

tests/standalone/precompilation_test.dart

Index: tests/standalone/precompilation_test.dart
diff --git a/tests/standalone/precompilation_test.dart b/tests/standalone/precompilation_test.dart
index 047ac0d5c6ba00c765ba178e92a21587c0e2d889..751682e2f77b6062a88dd60759b3d2091a7730c4 100644
--- a/tests/standalone/precompilation_test.dart
+++ b/tests/standalone/precompilation_test.dart
@@ -86,7 +86,7 @@ main(List args) {
     ld_library_path = "${ld_library_path}:${tmp.path}";
 
     result = Process.runSync(
-       "${dart_executable}",
+       "${dart_executable}_precompiled",
        ["--run-precompiled-snapshot", "ignored_script", "--hello"],
        workingDirectory: tmp.path,
        environment: {"LD_LIBRARY_PATH": ld_library_path});