Expand RS vector3 types to vector4.

BUG=5609007

The underlying LLVM implementation for vector3 types does this implicitly. If
RS does not adjust its implementation, we will always be misaligned for any
subsequent data after a vector3 type. We previously inserted padding into the
reflected layers from llvm-rs-cc (hence the skip padding part of this change).
We can safely ignore the padding now that the Java/native code is updated to
use the expanded size. The compiler will also need modification to ensure that
we don't mistakenly skip over any end-of-struct padding.

Fixing the 3 component vector padding problem.

Change-Id: If68af42287deb8f4b28addcd19a9fa314656be44
diff --git a/rsComponent.h b/rsComponent.h
index 6ddc990..8629d0d 100644
--- a/rsComponent.h
+++ b/rsComponent.h
@@ -41,6 +41,7 @@
     bool getIsFloat() const {return mIsFloat;}
     bool getIsSigned() const {return mIsSigned;}
     uint32_t getBits() const {return mBits;}
+    uint32_t getBitsUnpadded() const {return mBitsUnpadded;}
 
     // Helpers for reading / writing this class out
     void serialize(OStream *stream) const;
@@ -56,6 +57,7 @@
 
     // derived
     uint32_t mBits;
+    uint32_t mBitsUnpadded;
     uint32_t mTypeBits;
     bool mIsFloat;
     bool mIsSigned;