[OPENMP 5.0]Add initial support for 'allocate' directive.

Added parsing/sema analysis/serialization/deserialization support for
'allocate' directive.

llvm-svn: 355614
diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index 84d79d9..0cca269 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -1734,7 +1734,8 @@
 /// [C++11] attribute-specifier-seq decl-specifier-seq[opt]
 ///             init-declarator-list ';'
 ///[C90/C++]init-declarator-list ';'                             [TODO]
-/// [OMP]   threadprivate-directive                              [TODO]
+/// [OMP]   threadprivate-directive
+/// [OMP]   allocate-directive                                   [TODO]
 ///
 ///       for-range-declaration: [C++11 6.5p1: stmt.ranged]
 ///         attribute-specifier-seq[opt] type-specifier-seq declarator