Remove the use of Method from jni_compiler

Change-Id: Ibf1c72a806e7f1ba7a2d83960c3d57f41937d336
diff --git a/src/primitive.h b/src/primitive.h
index 259378d..240892f 100644
--- a/src/primitive.h
+++ b/src/primitive.h
@@ -68,6 +68,7 @@
 
   static size_t ComponentSize(Type type) {
     switch (type) {
+      case kPrimVoid:    return 0;
       case kPrimBoolean:
       case kPrimByte:    return 1;
       case kPrimChar: