More stringently verify expected alignment of fields in hidl compound types.

Change-Id: I222d78163ac5d7cc5af405b0c3d0586ed7528213
Bug: 33846034
Test: make
diff --git a/VectorType.h b/VectorType.h
index c267ba9..73ce814 100644
--- a/VectorType.h
+++ b/VectorType.h
@@ -121,6 +121,7 @@
     bool resultNeedsDeref() const override;
 
     bool isJavaCompatible() const override;
+    bool containsPointer() const override;
 
     void getAlignmentAndSize(size_t *align, size_t *size) const override;