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/target_parallel_reduction_messages.cpp b/clang/test/OpenMP/target_parallel_reduction_messages.cpp
index 3f7eef0..c9434e7 100644
--- a/clang/test/OpenMP/target_parallel_reduction_messages.cpp
+++ b/clang/test/OpenMP/target_parallel_reduction_messages.cpp
@@ -97,7 +97,7 @@
   foo();
 #pragma omp target parallel reduction(& : argc // expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{invalid operands to binary expression ('float' and 'float')}}
   foo();
-#pragma omp target parallel reduction(| : argc, // expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{invalid operands to binary expression ('float' and 'float')}}
+#pragma omp target parallel reduction(| : argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{invalid operands to binary expression ('float' and 'float')}}
   foo();
 #pragma omp target parallel reduction(|| : argc ? i : argc) // expected-error 2 {{expected variable name, array element or array section}}
   foo();
@@ -195,7 +195,7 @@
   foo();
 #pragma omp target parallel reduction(foo : argc // expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{incorrect reduction identifier, expected one of '+', '-', '*', '&', '|', '^', '&&', '||', 'min' or 'max'}}
   foo();
-#pragma omp target parallel reduction(| : argc, // expected-error {{expected ')'}} expected-note {{to match this '('}}
+#pragma omp target parallel reduction(| : argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
   foo();
 #pragma omp target parallel reduction(|| : argc > 0 ? argv[1] : argv[2]) // expected-error {{expected variable name, array element or array section}}
   foo();