Ignore missing desugar conversion types

Change-Id: I26190763946897eb4d2f2112028bd2d385fa48e4

src/main/java/com/android/tools/r8/graph/DexItemFactory.java

diff --git a/src/main/java/com/android/tools/r8/graph/DexItemFactory.java b/src/main/java/com/android/tools/r8/graph/DexItemFactory.java
index f8aa084..4cb631b 100644
--- a/src/main/java/com/android/tools/r8/graph/DexItemFactory.java
+++ b/src/main/java/com/android/tools/r8/graph/DexItemFactory.java
@@ -422,9 +422,27 @@
   public final DexType reflectiveOperationExceptionType =
       createStaticallyKnownType(reflectiveOperationExceptionDescriptor);
   public final DexType kotlinMetadataType = createStaticallyKnownType(kotlinMetadataDescriptor);
+
+  public final DexType doubleSummaryStatisticsConversionsType =
+      createStaticallyKnownType("Ljava/util/DoubleSummaryStatisticsConversions;");
+  public final DexType intSummaryStatisticsConversionsType =
+      createStaticallyKnownType("Ljava/util/IntSummaryStatisticsConversions;");
+  public final DexType longSummaryStatisticsConversionsType =
+      createStaticallyKnownType("Ljava/util/LongSummaryStatisticsConversions;");
+  public final DexType optionalConversionsType =
+      createStaticallyKnownType("Ljava/util/OptionalConversions;");
   public final DexType timeConversionsType =
       createStaticallyKnownType("Ljava/time/TimeConversions;");
 
+  public Iterable<DexType> getConversionTypes() {
+    return ImmutableList.of(
+        doubleSummaryStatisticsConversionsType,
+        intSummaryStatisticsConversionsType,
+        longSummaryStatisticsConversionsType,
+        optionalConversionsType,
+        timeConversionsType);
+  }
+
   public final DexType javaIoFileType = createStaticallyKnownType("Ljava/io/File;");
   public final DexType javaMathBigIntegerType = createStaticallyKnownType("Ljava/math/BigInteger;");
   public final DexType javaNioByteOrderType = createStaticallyKnownType("Ljava/nio/ByteOrder;");

src/main/java/com/android/tools/r8/shaking/MissingClasses.java

diff --git a/src/main/java/com/android/tools/r8/shaking/MissingClasses.java b/src/main/java/com/android/tools/r8/shaking/MissingClasses.java
index 0fe1645..1def3a9 100644
--- a/src/main/java/com/android/tools/r8/shaking/MissingClasses.java
+++ b/src/main/java/com/android/tools/r8/shaking/MissingClasses.java
@@ -122,19 +122,22 @@
     }
 
     private static Collection<DexType> getAllowedMissingClasses(DexItemFactory dexItemFactory) {
-      return ImmutableList.of(
-          dexItemFactory.annotationDefault,
-          dexItemFactory.annotationMethodParameters,
-          dexItemFactory.annotationSourceDebugExtension,
-          dexItemFactory.annotationSynthesizedClass,
-          dexItemFactory.annotationSynthesizedClassMap,
-          dexItemFactory.annotationThrows,
-          dexItemFactory.serializedLambdaType,
-          // TODO(b/176133674) StringConcatFactory is backported, but the class is reported as
-          //  missing because the enqueuer runs prior to backporting and thus sees the non-desugared
-          //  code.
-          dexItemFactory.stringConcatFactoryType,
-          dexItemFactory.timeConversionsType);
+      return ImmutableList.<DexType>builder()
+          .add(
+              dexItemFactory.annotationDefault,
+              dexItemFactory.annotationMethodParameters,
+              dexItemFactory.annotationSourceDebugExtension,
+              dexItemFactory.annotationSynthesizedClass,
+              dexItemFactory.annotationSynthesizedClassMap,
+              dexItemFactory.annotationThrows,
+              dexItemFactory.serializedLambdaType,
+              // TODO(b/176133674) StringConcatFactory is backported, but the class is reported as
+              //  missing because the enqueuer runs prior to backporting and thus sees the
+              // non-desugared
+              //  code.
+              dexItemFactory.stringConcatFactoryType)
+          .addAll(dexItemFactory.getConversionTypes())
+          .build();
     }
 
     private Predicate<DexType> isCompilerSynthesizedAllowedMissingClasses(AppView<?> appView) {