Bump oat version to delete bogus artifacts.

Bug: 214850438
Test: test.py
Change-Id: I1d581d665e086cce48574ecf33f7f333e0d226b8
diff --git a/runtime/oat.h b/runtime/oat.h
index 36ef459..7e5e7e9 100644
--- a/runtime/oat.h
+++ b/runtime/oat.h
@@ -32,8 +32,8 @@
 class PACKED(4) OatHeader {
  public:
   static constexpr std::array<uint8_t, 4> kOatMagic { { 'o', 'a', 't', '\n' } };
-  // Last oat version changed reason: ARM64: Enable implicit suspend checks; madvise().
-  static constexpr std::array<uint8_t, 4> kOatVersion { { '2', '1', '9', '\0' } };
+  // Last oat version changed reason: bump version after compiler/runtime bug.
+  static constexpr std::array<uint8_t, 4> kOatVersion { { '2', '2', '0', '\0' } };
 
   static constexpr const char* kDex2OatCmdLineKey = "dex2oat-cmdline";
   static constexpr const char* kDebuggableKey = "debuggable";