Fix running of some tests

The two tests 421-large-frame and 551-checker-shifter-operand have Dex version
037 in the dex files generated by dx and Jack, so to avoid these tests to fail
raise the min api level.

Change-Id: I1b89f30d17cea7c3c571b03b45fb30da46428858
diff --git a/src/test/java/com/android/tools/r8/R8RunArtTestsTest.java b/src/test/java/com/android/tools/r8/R8RunArtTestsTest.java
index 094097f..bf409d8 100644
--- a/src/test/java/com/android/tools/r8/R8RunArtTestsTest.java
+++ b/src/test/java/com/android/tools/r8/R8RunArtTestsTest.java
@@ -146,9 +146,9 @@
           // Desugaring of interface private methods is not yet supported.
           .put("975-iface-private", AndroidApiLevel.N)
           // The extended check for overlapping long registers cause this to run out of registers.
-          .put("421-large-frame", AndroidApiLevel.L)
+          .put("421-large-frame", AndroidApiLevel.N)
           // The extended check for overlapping long registers cause this to run out of registers.
-          .put("551-checker-shifter-operand", AndroidApiLevel.L)
+          .put("551-checker-shifter-operand", AndroidApiLevel.N)
           .build();
 
   // Tests that timeout when run with Art.