More OpenMP test case compatibility fixes

Allow "signext" in a couple of more places in recently
added test cases to fix failures on SystemZ.

llvm-svn: 219615
diff --git a/clang/test/OpenMP/parallel_if_codegen.cpp b/clang/test/OpenMP/parallel_if_codegen.cpp
index 65ef35d..44c874f 100644
--- a/clang/test/OpenMP/parallel_if_codegen.cpp
+++ b/clang/test/OpenMP/parallel_if_codegen.cpp
@@ -74,7 +74,7 @@
 // CHECK: [[OMP_END]]
 #pragma omp parallel if (Arg)
   fn6();
-  // CHECK: = call i{{.+}} @{{.+}}tmain
+  // CHECK: = call {{.*}}i{{.+}} @{{.+}}tmain
   return tmain(Arg);
 }