Keep bridge modifier on bridge methods moved to the companion class

Bug: 168790907
Change-Id: I8533a041f9bd38a004d06cb312ed1d6c6976f216

src/main/java/com/android/tools/r8/ir/desugar/InterfaceProcessor.java

diff --git a/src/main/java/com/android/tools/r8/ir/desugar/InterfaceProcessor.java b/src/main/java/com/android/tools/r8/ir/desugar/InterfaceProcessor.java
index d73a7c1..42787b7 100644
--- a/src/main/java/com/android/tools/r8/ir/desugar/InterfaceProcessor.java
+++ b/src/main/java/com/android/tools/r8/ir/desugar/InterfaceProcessor.java
@@ -240,7 +240,6 @@
         }
 
         MethodAccessFlags newFlags = virtual.accessFlags.copy();
-        newFlags.unsetBridge();
         newFlags.promoteToStatic();
         DexEncodedMethod.setDebugInfoWithFakeThisParameter(
             code, companionMethod.getArity(), appView);