[OPENMP 4.0] Initial support for array sections.

Adds parsing/sema analysis/serialization/deserialization for array sections in OpenMP constructs (introduced in OpenMP 4.0).
Currently it is allowed to use array sections only in OpenMP clauses that accepts list of expressions.
Differential Revision: http://reviews.llvm.org/D10732

llvm-svn: 245937
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 7b4277b..4f6666d 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -8728,6 +8728,7 @@
   case Expr::ImaginaryLiteralClass:
   case Expr::StringLiteralClass:
   case Expr::ArraySubscriptExprClass:
+  case Expr::OMPArraySectionExprClass:
   case Expr::MemberExprClass:
   case Expr::CompoundAssignOperatorClass:
   case Expr::CompoundLiteralExprClass: