Extract ParseInfo from CompilationInfo.

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index b0239b367cfd63ec6dd9c04bc03a9c5b6e462aff..8cccefe50b073fac85f98dc3c85478088231edca 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -452,6 +452,13 @@ enum VisitMode {
 enum NativesFlag { NOT_NATIVES_CODE, NATIVES_CODE };
 
 
+// ParseRestriction is used to restrict the set of valid statements in a
+// unit of compilation.  Restriction violations cause a syntax error.
+enum ParseRestriction {
+  NO_PARSE_RESTRICTION,         // All expressions are allowed.
+  ONLY_SINGLE_FUNCTION_LITERAL  // Only a single FunctionLiteral expression.
+};
+
 // A CodeDesc describes a buffer holding instructions and relocation
 // information. The instructions start at the beginning of the buffer
 // and grow forward, the relocation information starts at the end of