PCH support for a few very, very simple kinds of expressions. Hook up
expression (de-)serialization for VLAs, variable initializers,
enum constant initializers, and bitfield widths.

llvm-svn: 69075
diff --git a/clang/test/PCH/enum.h b/clang/test/PCH/enum.h
index cfa8d6f..c94e314 100644
--- a/clang/test/PCH/enum.h
+++ b/clang/test/PCH/enum.h
@@ -8,9 +8,9 @@
 
 enum Shape {
   Square,
-  Triangle,
+  Triangle = 17,
   Rhombus,
   Circle
 };
 
-enum Shape aRoundShape = Circle;
+enum Shape aRoundShape;// FIXME: = Circle;