Support for 64-bit integer type.

b/3050131 exported renderscript structures don't appear to support int64_t

Change-Id: I9aea676425b694a3a6457e63e38b00e591847e20
diff --git a/graphics/java/android/renderscript/RenderScript.java b/graphics/java/android/renderscript/RenderScript.java
index c952d79..3c0b4e5 100644
--- a/graphics/java/android/renderscript/RenderScript.java
+++ b/graphics/java/android/renderscript/RenderScript.java
@@ -501,6 +501,7 @@
     Element mElement_I16;
     Element mElement_U32;
     Element mElement_I32;
+    Element mElement_I64;
     Element mElement_F32;
     Element mElement_F64;
     Element mElement_BOOLEAN;