Revert "[OPENMP] Allow skip expression after comma in clauses with lists."

This reverts commit http://reviews.llvm.org/rL265003. After some
thoughts decided to emit errors here.

llvm-svn: 265119
diff --git a/clang/test/OpenMP/single_private_messages.cpp b/clang/test/OpenMP/single_private_messages.cpp
index 1a2ba3f..0ed0e6c 100644
--- a/clang/test/OpenMP/single_private_messages.cpp
+++ b/clang/test/OpenMP/single_private_messages.cpp
@@ -104,7 +104,7 @@
   foo();
 #pragma omp single private(argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
   foo();
-#pragma omp single private(argc, // expected-error {{expected ')'}} expected-note {{to match this '('}}
+#pragma omp single private(argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
   foo();
 #pragma omp single private(argc > 0 ? argv[1] : argv[2]) // expected-error {{expected variable name}}
   foo();
@@ -162,7 +162,7 @@
   foo();
 #pragma omp single private(argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
   foo();
-#pragma omp single private(argc, // expected-error {{expected ')'}} expected-note {{to match this '('}}
+#pragma omp single private(argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
   foo();
 #pragma omp single private(argc > 0 ? argv[1] : argv[2]) // expected-error {{expected variable name}}
   foo();