Version 2.1.78

Add GenericSignatureTypeRewriter and use it for rewriting.

Bug: 170915828
Bug: 154793333
Change-Id: I96aa566d605c85c4899bfa414069c0798640183e

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 38a4353..ae3d5a4 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 = "2.1.77";
+  public static final String LABEL = "2.1.78";
 
   private Version() {
   }