Add a QAST::CompUnit, which will be involved in SC handling and a few…

… other things we have one of per compilation unit.

src/QAST/CompUnit.nqp

@@ -0,0 +1,18 @@
+class QAST::CompUnit is QAST::Node {
+    # The serialization context for the compilation unit.
+    has $!sc;
+
+    # The HLL name.
+    has $!hll;
+
+    # What to run at the point the compilation unit is loaded.
+    has $!load;
+
+    # What to run if this is the main entry point.
+    has $!main;
+
+    method sc(*@value)       { $!sc := @value[0] if @value; $!sc }
+    method hll(*@value)      { $!hll := @value[0] if @value; $!hll }
+    method load(*@value)     { $!load := @value[0] if @value; $!load }
+    method main(*@value)     { $!main := @value[0] if @value; $!main }
+}

tools/build/Makefile.in

@@ -83,6 +83,7 @@ QAST_SOURCES = \
   src/QAST/Stmts.nqp \
   src/QAST/Stmt.nqp \
   src/QAST/Block.nqp \
+  src/QAST/CompUnit.nqp \
   src/QAST/Operations.nqp \
   src/QAST/Compiler.nqp \