[OPENMP50]Basic support for conditional lastprivate.

Added parsing/sema checks for conditional lastprivates.
diff --git a/clang/test/OpenMP/distribute_simd_lastprivate_messages.cpp b/clang/test/OpenMP/distribute_simd_lastprivate_messages.cpp
index b6efc4c..8929b88 100644
--- a/clang/test/OpenMP/distribute_simd_lastprivate_messages.cpp
+++ b/clang/test/OpenMP/distribute_simd_lastprivate_messages.cpp
@@ -1,6 +1,8 @@
-// RUN: %clang_cc1 -verify -fopenmp %s -Wuninitialized
+// RUN: %clang_cc1 -verify=expected,omp45 -fopenmp-version=45  -fopenmp %s -Wuninitialized
+// RUN: %clang_cc1 -verify=expected,omp50 -fopenmp-version=50 -fopenmp %s -Wuninitialized
 
-// RUN: %clang_cc1 -verify -fopenmp-simd %s -Wuninitialized
+// RUN: %clang_cc1 -verify=expected,omp45 -fopenmp-version=45 -fopenmp-simd %s -Wuninitialized
+// RUN: %clang_cc1 -verify=expected,omp50 -fopenmp-version=50 -fopenmp-simd %s -Wuninitialized
 
 extern int omp_default_mem_alloc;
 void foo() {
@@ -113,6 +115,11 @@
     ++k;
 #pragma omp target
 #pragma omp teams
+#pragma omp distribute simd lastprivate(conditional: argc) lastprivate(conditional: // expected-error 2 {{use of undeclared identifier 'conditional'}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp target
+#pragma omp teams
 #pragma omp distribute simd lastprivate(a, b) // expected-error {{lastprivate variable with incomplete type 'S1'}} expected-warning {{Type 'const S2' is not trivially copyable and not guaranteed to be mapped correctly}}
   for (int k = 0; k < argc; ++k)
     ++k;
@@ -298,8 +305,8 @@
     foo();
 #pragma omp target
 #pragma omp teams
-#pragma omp distribute simd lastprivate(i) // expected-note {{defined as lastprivate}}
-  for (i = 0; i < argc; ++i) // expected-error{{loop iteration variable in the associated loop of 'omp distribute simd' directive may not be lastprivate, predetermined as linear}}
+#pragma omp distribute simd lastprivate(i) // omp45-note {{defined as lastprivate}}
+  for (i = 0; i < argc; ++i) // omp45-error{{loop iteration variable in the associated loop of 'omp distribute simd' directive may not be lastprivate, predetermined as linear}}
     foo();
 #pragma omp target
 #pragma omp teams