vector: Introduce shrink() function to shrink vector size without loosing data.

Change-Id: I9c0ac2715aea1a90c9e6ebcd982522b80a547099
diff --git a/CommonLibs/Vector.h b/CommonLibs/Vector.h
index 7062e17..eae674b 100644
--- a/CommonLibs/Vector.h
+++ b/CommonLibs/Vector.h
@@ -92,6 +92,13 @@
 		mEnd = mStart + newSize;
 	}
 
+	/** Reduce addressable size of the Vector, keeping content. */
+	void shrink(size_t newSize)
+	{
+		assert(newSize <= mEnd - mStart);
+		mEnd = mStart + newSize;
+	}
+
 	/** Release memory and clear pointers. */
 	void clear() { resize(0); }