Add rsForEachInternal

Bug: 23535985

Added a compiler intrinsic rsParallelFor to the runtime API, which
is translated into an internal API (rsForEachInternal) by slang.

Added a test to RsTest (for native) and RSTest_CompatLib
(for support).

Enhanced the auto api generator to handle ellipsis argument,
intrinsics, internal-only APIs, and special level for API under
development.

Change-Id: I6e2cf3db868f426aa8e0b9a77732b66c1e6b9f03
diff --git a/api/Utilities.cpp b/api/Utilities.cpp
index 4268278..841d824 100644
--- a/api/Utilities.cpp
+++ b/api/Utilities.cpp
@@ -163,7 +163,7 @@
 }
 
 string makeAttributeTag(const string& userAttribute, const string& additionalAttribute,
-                        int deprecatedApiLevel, const string& deprecatedMessage) {
+                        unsigned int deprecatedApiLevel, const string& deprecatedMessage) {
     ostringstream stream;
     bool needComma = false;
     if (userAttribute[0] == '=') {