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

Compatibility fix for better compatibility with the existing software.

llvm-svn: 265003
diff --git a/clang/test/OpenMP/for_linear_messages.cpp b/clang/test/OpenMP/for_linear_messages.cpp
index ab89349..be79d11 100644
--- a/clang/test/OpenMP/for_linear_messages.cpp
+++ b/clang/test/OpenMP/for_linear_messages.cpp
@@ -111,7 +111,7 @@
   for (int k = 0; k < argc; ++k) ++k;
   #pragma omp for linear (argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
   for (int k = 0; k < argc; ++k) ++k;
-  #pragma omp for linear (argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  #pragma omp for linear (argc, // expected-error {{expected ')'}} expected-note {{to match this '('}}
   for (int k = 0; k < argc; ++k) ++k;
   #pragma omp for linear (argc > 0 ? argv[1] : argv[2]) // expected-error {{expected variable name}}
   for (int k = 0; k < argc; ++k) ++k;
@@ -177,7 +177,7 @@
   for (int k = 0; k < argc; ++k) ++k;
   #pragma omp for linear (argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
   for (int k = 0; k < argc; ++k) ++k;
-  #pragma omp for linear (argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  #pragma omp for linear (argc, // expected-error {{expected ')'}} expected-note {{to match this '('}}
   for (int k = 0; k < argc; ++k) ++k;
   #pragma omp for linear (argc > 0 ? argv[1] : argv[2]) // expected-error {{expected variable name}}
   for (int k = 0; k < argc; ++k) ++k;