added chapter heading for GC

book.tex

@@ -880,7 +880,7 @@ into the text representation for x86 (Figure~\ref{fig:x86-a}).
 \label{fig:x86-ast-a}
 \end{figure}
 
-\section{From $S_0$ to x86-64 through $C_0$}
+\section{From $S_0$ to x86-64 via $C_0$}
 \label{sec:plan-s0-x86}
 
 To compile one language to another it helps to focus on the
@@ -1763,6 +1763,11 @@ $S_1$.
 \chapter{Tuples and Heap Allocation}
 \label{ch:tuples}
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\chapter{Garbage Collection}
+\label{ch:gc}
+
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \chapter{Functions}
 \label{ch:functions}