Version 3.1.64

Bug: 213369062
Change-Id: I916850bc386843be9f25e3f5d8b2e9905d826da6

src/main/java/com/android/tools/r8/Version.java

diff --git a/src/main/java/com/android/tools/r8/Version.java b/src/main/java/com/android/tools/r8/Version.java
index 592efa9..903f4db 100644
--- a/src/main/java/com/android/tools/r8/Version.java
+++ b/src/main/java/com/android/tools/r8/Version.java
@@ -11,7 +11,7 @@
 
   // This field is accessed from release scripts using simple pattern matching.
   // Therefore, changing this field could break our release scripts.
-  public static final String LABEL = "3.1.63";
+  public static final String LABEL = "3.1.64";
 
   private Version() {
   }